Local zoning · Merced County

Merced County — Signage

Signage under the Merced County local zoning and planning code, with the controlling citations.

Last reviewed: July 6, 2026

Overview

This page distills how the Merced County Zoning Code regulates signs in the unincorporated areas. The County’s sign rules are content-neutral, set by the Zoning Code’s Sign Regulations, and vary by zone category (residential, agricultural, commercial/mixed-use, industrial) and certain overlays. Most permanent and temporary signs need a Sign Permit; some are exempt, while others are expressly prohibited. See the County’s core rules in Chapter 18.44 (Sign Regulations), plus cross-references to procedures and nonconformities elsewhere in Title 18.

Key rule: Sign allowances are content-neutral and largely tied to building or tenant frontage; most permanent signs count toward a maximum area and must meet the zone’s setbacks and height limits. See § 18.44.020 and § 18.44.100.

For a policy/definitions overview, start at § 18.44.010–.030 (purpose, content-neutrality, and definitions).
Approval pathways and submittals are in § 18.44.040–.060; multi-tenant projects may need a Comprehensive Sign Program.
Technical sign-type standards live in § 18.44.100–.110 and zone-specific tables (Tables 3-14 to 3-18).
Nonconforming, maintenance, and removal rules appear in § 18.44.180–.200.

Use this with the County-wide backdrop on Merced County Zoning, land uses in Merced County Land Use, cross-cutting Merced County Development Standards, and when applicable, Merced County Design Review.

Countywide sign framework (applies in all unincorporated zones)

Purpose and content neutrality. The sign chapter exists to enhance appearance and safety in unincorporated areas, protect property values, and avoid visual clutter; it regulates size, height, number, location, materials and illumination without favoring message content. See § 18.44.010–.020.
Sign Permit trigger. A Sign Permit is required unless a sign is specifically exempt in § 18.44.070; permit applications must include scaled plans, materials, lighting, and computations. See § 18.44.040–.060.
Comprehensive Sign Program (CSP). Required for new commercial, industrial, and mixed-use developments with five or more tenants; contains a coordinated package and binds all on-site signs after approval. See § 18.44.050 and § 18.44.170.
Exempt signs. Examples include government notices, holiday displays (time-limited), noncommercial temporary signs (size/time/location limits), commemorative plaques, interior, murals without logos, “No Trespassing,” real estate signs (size/illumination limits), and incidental business notices (aggregate size cap). See § 18.44.070.
Prohibited signs. Animated, portable, roof or above-eave, billboards, tethered balloons/inflatables, certain color lights that could confuse traffic signals, and more. See § 18.44.080.
Temporary signs. On-site subdivision, construction, holiday/special event, grand-opening banners, and off-site subdivision/open house signs are allowed with specific size, height, setback, and duration standards and usually a Sign Permit. See § 18.44.090.
Location and lighting. All signs must meet the underlying zone’s setbacks; no projecting into public rights-of-way. Lights must minimize glare; illuminated signs need a Building Permit; Director can grant up to 15% modifications via the Variances/Minor Deviations process. See § 18.44.100(F)–(H) and § 18.126.020.
Area measurement. Max allowed sign area is tied to linear frontage; measurement methods and frontage-based examples are in § 18.44.100(C).
Maintenance and removal. Poorly maintained signs must be repaired or removed; unsafe/unlawful public property signs can be abated; obsolete/abandoned signs must be removed. See § 18.44.180–.190.
Nonconforming signs. Amortization schedules apply (e.g., 10–10.5 years for many commercial/mixed-use and billboards; up to 15 years in ag/residential), plus limits on alterations and site-wide compliance preconditions. See § 18.44.200 and Table 3-19.
For broader context on legacy conditions and enforcement, also see Merced County Nonconforming Uses.

Standards by sign type (highlights)

Wall signs. Channel letters on raceways; cabinet signs are prohibited except as logos; centered placement; min 6-inch letter height; cannot extend above roofline or over public ROW. See § 18.44.110(L).
Projecting signs. One per establishment; up to 4 sq ft; 8 ft minimum clearance; not internally illuminated. See § 18.44.110(K).
Window signs. Allowed on ground and second story only; max 25% coverage per window; not counted toward sign area; no illumination. See § 18.44.110(M).
Awning/canopy signs. Lettering limited to a portion of the awning surface; 8 ft clearance; external hooded floodlight only; no back-lit awnings. See § 18.44.110(A).
Freeway-oriented signs. Addressed by § 18.44.110(F) and zone-specific rules; in agricultural zones they generally require a Conditional Use Permit and must meet setbacks, with conditions potentially increasing setbacks. See § 18.44.160(D)(4).

District-by-district: what changes by zone (unincorporated areas only)

This section translates the zone-by-zone allowances in Chapter 18.44’s tables and standards. For building setbacks, heights, and other base metrics see Merced County Development Standards; for discretionary design review triggers see Merced County Design Review.

Residential zones — R-R, R-1, R-1-5000, R-2, R-3, R-4, M-H

What the County allows. The sign menu and permit tiering for each residential district are listed in Table 3-16, including monument entry signs for subdivisions and institutional uses, nameplates, flags (exempt), and certain directional/directory signs for higher-density or institutional contexts. See § 18.44.140(C) and cross-references to Table 3-14 (dimensions).
Key dimensional rules. Example: subdivision/multifamily entry signs range from 12 sq ft (5–19 units) to 40 sq ft (20+ units) per entrance; freestanding entry signs are capped at 6 ft height; cabinet signs are prohibited. See Table 3-14 and § 18.44.110(E), (L).
Placement. Must be on the premises; comply with zone setbacks; institutional-use signs require a minimum 5 ft offset from front property line and sight distance compliance. See § 18.44.140(B) and (D).
Special notes. Community entry signs beyond allowed area need a CUP; flagpoles limited to 30 ft with flags up to 5 ft × 8 ft. See § 18.44.140(D).

Agricultural zones — all ag districts

What the County allows. Agricultural zones use Table 3-18 for sign types and permit tiers (e.g., monument, nameplate, directional/directory, price/menu for walk-in). See § 18.44.160(C).
Specific ag rules.
- Freeway-oriented signs require a CUP and at minimum meet zone setbacks; conditions may increase them.
- Monument signs must relate to a County-permitted agricultural business.
- One monument sign per single-tenant, parcel, or multi-tenant complex for non-ag uses in ag zones.
- Community entry signs over the standard area need a CUP; flagpoles capped at 30 ft with flags up to 5 ft × 8 ft. See § 18.44.160(D).

Commercial and mixed-use zones — including C-P (Professional Office)

What the County allows. Sign development standards reference Table 3-15 for permanent signs (structure and freestanding), plus sign-type standards in § 18.44.110. See § 18.44.150(B).
Key dimensional rules (highlights from Table 3-15).
- Freestanding: 1 per primary frontage; up to 1 sq ft per linear foot of primary building frontage, max 100 sq ft area; monument height 6 ft; pole height 20 ft. Secondary frontage may add a second sign (area ≤ 50% of primary). See Table 3-15 and § 18.44.110(E).
- Structure signs on secondary frontage: additional awning/canopy, painted, projecting, and wall sign allowances with caps per frontage and total wall sign area limits (often 100–150 sq ft for accessory/secondary walls). See Table 3-15 and § 18.44.110(H), (K), (L).
Specific commercial/mixed-use rules. One pole sign per tenant/parcel/center, except no pole signs in the C-P zone; monument signs must include landscaping at a ratio of 2 sq ft of landscaping per 1 sq ft of sign (not required in C-P). Freeway-oriented signs must meet setbacks; conditions may increase. See § 18.44.150(D).
Coordinate monument landscaping with Merced County Landscaping and Screening.

Industrial zones — B-P (Business Park), M-1, M-2

What the County allows. Industrial zones apply the same Table 3-15 sign standards as commercial/mixed-use for freestanding and structure signs, along with § 18.44.110 specifics. See § 18.44.150(B).
Where these zones apply. See the zoning map and industrial standards table for B-P, M-1, M-2 in § 18.16.030 for base development metrics; signage still follows Chapter 18.44.

Overlay — Castle Commerce Center and Airport Special Planning Zone (SPZ)

Permanent signs. Monument, freestanding, and on-building signs have bespoke size/height caps (e.g., freestanding up to 12 ft, 48 sq ft per face; on-building at 1.0 or 0.5 sq ft per linear foot depending on orientation). See Table 2-10.
Temporary signs. Grand opening banners and other temporary categories have overlay-specific sizes/durations in Table 2-11.
Design and location. Only internal illumination is allowed for most signs; monument/freestanding signs must sit at least 5 ft behind the existing/ultimate ROW. Certain signs are prohibited (A-frames, animated, off-premises, portable, vehicle, window, temporary political, electronic reader boards). See overlay standards and cross-reference to § 18.44.
For other mapped overlays that may affect signs (e.g., scenic, historic), see Merced County Overlay Districts and Merced County Historic Preservation.

Electronic digital display message signs (countywide)

Permit type. Require a Conditional Use Permit and State/Federal compliance; County may require revenue/public benefits conditions. See § 18.44.130(B)–(C).
Development standards. Max display area 1,200 sq ft (face), max overall height 25 ft, min 1,500 ft separation between such signs, back-to-back double faces only, single cylindrical support, mechanical screening, owner ID sign. See § 18.44.130(E).
Operations. Brightness capped at 5,000 nits (day)/500 nits (night) with automatic dimming; static display for ≥8 seconds; no fades/scrolls/animations; 30-day post-installation brightness review; must freeze or go dark on malfunction. See § 18.44.130(F).

Permit pathways and related processes

Sign Permits and CSPs are administered as sign-related permits under § 18.110.020(A)(5); some projects also undergo site plan/design review. See § 18.110.020(A)(6) and Chapter 18.122.
If a modest modification is needed, the Director may approve up to a 15% deviation under § 18.44.100(H) and the Merced County Variances and Exceptions framework.
Illumination and building permits. Illuminated signs require a Building Permit; electrical/back-lit details fall under the California Building Standards Code. See § 18.44.100(G)(2).

Quick reference: selected standards

Topic	Core rule (unincorporated areas)	Code Reference
Content neutrality	County regulates time/place/manner, not message content.	§ 18.44.020
Permit trigger	All signs need a Sign Permit unless exempt; CSP required for many multi-tenant projects.	§ 18.44.040–.060; § 18.44.050; § 18.44.170
Freestanding (C/MU/Ind)	1 per primary frontage; area up to 1 sq ft/lf of building frontage (max 100 sq ft); height: monument 6 ft, pole 20 ft; secondary frontage up to 50% of primary area.	Table 3-15; § 18.44.110(E)
Wall signs	Channel letters; cabinet signs prohibited except for logos; additional secondary-frontage allowances with total wall-area caps (often 100–150 sq ft).	§ 18.44.110(L); Table 3-15
Window signs	Ground/second story only; ≤25% of each window; not counted toward overall sign area; no illumination.	§ 18.44.110(M)
Projecting signs	One per establishment; ≤4 sq ft; ≥8 ft clearance; not internally illuminated.	§ 18.44.110(K)
Residential entries	Subdivision/multifamily entry signs from 12 to 40 sq ft; freestanding ≤6 ft high.	Table 3-14; § 18.44.110(E), (L)
Temporary signs	Detailed categories with duration/size/setback; many require a Sign Permit.	§ 18.44.090
Prohibited signs	Animated, portable, roof/above-eave, billboards, inflatables, certain colors interfering with traffic control.	§ 18.44.080
Nonconforming	Amortization and alteration limits; new permits may require site-wide compliance.	§ 18.44.200; Table 3-19

Checklist

Confirm the parcel is in the unincorporated County (not within an incorporated city) and identify its base zone/any overlays via Merced County Zoning.
Calculate maximum sign area from building/tenant frontage; choose sign types allowed for your zone category and frontage status (primary vs. secondary). See § 18.44.100(C) and Table 3-14/3-15.
Verify setback, height, and lighting rules; no encroachment into public right-of-way. See § 18.44.100(F)–(G).
Determine permit: Exempt vs. Sign Permit; if 5+ tenants, prepare a Comprehensive Sign Program. See § 18.44.070; § 18.44.050.
Prepare submittals (scaled plans, materials, illumination, computations) and file the Sign Permit or CSP. See § 18.44.060; § 18.44.170(A).
If illuminated, coordinate the Building/Electrical Permit under the California Building Standards Code. See § 18.44.100(G)(2).
For digital displays, pursue a CUP and address brightness, message duration, spacing, and support standards. See § 18.44.130.
Maintain signs; remove obsolete/abandoned ones; correct nonconformities per schedules. See § 18.44.180–.200.

Risks & Ambiguities

Issue	Why it matters	What to verify
Secondary-frontage entitlements	Additional wall/painted/projecting signs depend on whether a side is a “secondary frontage.”	Document tenant/building frontages and apply Table 3-15 correctly. § 18.44.110(H), (K), (L)
Pole sign eligibility in office zones	Pole signs are broadly allowed in commercial/mixed-use—except in C-P.	Confirm the exact commercial zone label; if C-P, plan a monument sign instead. § 18.44.150(D)(3)
Freeway-oriented sign placement	Setbacks can be increased via conditions; in ag zones a CUP is required.	Check frontage class, setback lines, and CUP conditions. § 18.44.160(D)(4)
Window sign coverage	Exceeding 25% per window can trigger denial or removal.	Calculate per individual glazed panel; keep illumination off. § 18.44.110(M)
Nonconforming signs on site	New permits may be withheld if legacy signs aren’t brought into compliance.	Inventory all signs; schedule removals per Table 3-19. § 18.44.200(C)
Illumination specs	Floodlighting, acrylic opacity, and nit caps affect design and fixtures.	Confirm external vs. internal illumination, shielding, and brightness. § 18.44.100(G); § 18.44.130(F)

Plain-English Summary

If your property is in the unincorporated County, the size and number of your signs mostly depend on your frontage and zone. Plan on a Sign Permit (unless your sign is exempt), follow setback/height limits, and keep lights subtle; billboards, roof signs, and animated/inflatable signs aren’t allowed. Bigger multi-tenant sites need a coordinated sign plan, and older nonconforming signs will eventually have to be removed or upgraded to meet current rules. See § 18.44.040–.080, § 18.44.100–.110, and zone tables.

Source References

Merced County Zoning Code, Chapter 18.44 Sign Regulations: § 18.44.010–.030 (purpose, neutrality, definitions) ; § 18.44.040–.070 (permits, CSP trigger, exempt signs) ; § 18.44.080–.090 (prohibited, temporary) ; § 18.44.100–.110 (standards; awning/canopy, wall, projecting, window, freestanding) ; § 18.44.120–.130 (iconic signs; electronic digital displays) ; § 18.44.140–.160 (residential, commercial/mixed-use/industrial, agricultural zone rules/tables) ; § 18.44.170 (CSP content/procedures) ; § 18.44.180–.200 (maintenance, removal, nonconforming)
Castle Commerce Center and Airport SPZ: Tables 2-10 and 2-11 (permanent and temporary sign standards) and related overlay rules
Title 18 procedures: § 18.110.020(A)(5) (Sign Permits/CSPs in review authority)
Industrial zones baseline context: § 18.16.030 (B-P, M-1, M-2)

Sources

Retrieved passages

Merced County Zoning Code (§ 2) High relevance
Merced County Zoning Code High relevance
Merced County Zoning Code (chapter shall) High relevance
Merced County Zoning Code High relevance
Merced County Zoning Code (§ 2) High relevance
Merced County Zoning Code High relevance
Merced County Zoning Code Medium relevance
Merced County Zoning Code (Article 8) Medium relevance
Merced County Zoning Code (§ 2) High relevance
Merced County Zoning Code High relevance
Merced County Zoning Code (§ 2) High relevance
Merced County Zoning Code High relevance
Merced County Zoning Code (§ 18.44.180.) High relevance
Merced County Zoning Code (§ 2) High relevance
Merced County Zoning Code (§ 2) High relevance
Merced County Zoning Code (§ 2) Medium relevance
Merced County Zoning Code (§ 18.44.050.) Medium relevance
Merced County Zoning Code (§ 2) Medium relevance
Merced County Zoning Code (§ 2) Medium relevance

Cited sections

Official Merced County code library

Frequently asked questions

Do I need a Sign Permit in unincorporated Merced County?

Usually yes. A Sign Permit is required for all signs unless they’re listed as exempt (e.g., certain government notices, temporary noncommercial signs within limits). Multi-tenant commercial, industrial, and mixed-use projects with five or more tenants also need a Comprehensive Sign Program. See § 18.44.040, § 18.44.050, and § 18.44.070.

How big can my freestanding monument or pole sign be on a commercial site?

For most commercial/mixed-use/industrial sites: one freestanding sign per primary street frontage; up to 1 sq ft of sign area per linear foot of primary building frontage (max 100 sq ft); monument signs max 6 ft tall; pole signs max 20 ft (no pole signs in C-P). Secondary frontage may allow an additional sign at up to 50% the primary’s area. See Table 3-15 and § 18.44.150(D).

Are billboards or animated signs allowed?

No. Billboards and animated signs are prohibited throughout the unincorporated County. Other prohibited categories include roof/above-eave signs, portable signs, and tethered balloons/inflatables. See § 18.44.080.

What are the rules for window signs?

Window signs are allowed only on the ground and second story; they can cover up to 25% of each individual window; they don’t count toward the max sign area; and illumination is prohibited. See § 18.44.110(M).

Can I install a digital billboard along a highway?

Electronic digital display message signs require a Conditional Use Permit and must meet strict size, height (25 ft), spacing (1,500 ft), and operational (brightness and 8-second static) limits, along with State/Federal compliance. See § 18.44.130.

What happens to my older, nonconforming sign when I pull a new sign permit?

New sign approvals can be conditioned on removing or bringing existing nonconforming signs into compliance. There are amortization timelines (often 10–10.5 years for many commercial/mixed-use signs) and restrictions on altering nonconforming signs. See § 18.44.200 and Table 3-19.

Do residential subdivisions get entry signage?

Yes. Subdivision and multifamily entry signs are allowed with area and height caps (e.g., up to 12–40 sq ft per entrance; freestanding entry signs up to 6 ft tall). Institutional uses in residential zones may have monument signs with specified setbacks. See Table 3-14 and § 18.44.140(D).

Are there special sign rules in the Castle Commerce Center and Airport SPZ?

Yes. The overlay sets unique sizes/heights for monument, freestanding, and on-building signs; requires at least 5 ft setbacks from ROW for monument/freestanding signs; and prohibits several sign types (e.g., A-frames, animated, window, portable, off-premises). See Tables 2-10 and 2-11 and overlay standards.

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