County Roads

Notes:
The blue pentagon is the current US standard for CR signage
Many places still use the old square standards or use a black pentagon
Individual counties can choose their own style shield
If a state is not listed here, it does not have a county road system
Utah has Federal Aid Routes, but currently have no coverage
Ohio has the greatest variation (see map below)

Notes:
If a county road is marked, a blue pentagon is used in all counties
Look for the unique warning at T-shaped intersections to identify Alabama

Baldwin Co

Geneva Co

Greene Co

Jackson Co

Mobile Co

Unique T-intersection marking

Notes:
Blue pentagons are not used in Maricopa County (Phoenix metro area)
Apache County has some blue pentagons (but they are rare)
Some of these CRs are also marked with a white square

Apache Co

White square marker

Notes:
Blue pentagons are used in NW Arkansas
Jasper in Newton County uses blue/gold on sign blades

Jasper, Newton Co

Washington Co

Notes:
California county roads are given a unique letter-number combination
A and B routes are in northern California
C and D routes are near the northern coast, but are not often marked
E routes are in and around Sacramento
G routes are near the central coast
J routes are in the central valley, south of Sacramento
N, R, and S routes are in southern California

Sierra Co

Sacramento Co

Monterey Co

Merced Co

T-junctions marked with yellow diamonds

Notes:
Fremont Co, Ouray Co, and Routt Co use green squares
Douglas Co uses green pentagons

Douglas Co

Fremont Co

Grand Co

Larimer Co

Notes:
Florida county road numbers can have up to 4 digits
Many CRs have a number-letter combination
Occasionally a black pentagon is used instead of blue

DeSoto Co

Monroe Co

Monroe Co, black sign

Nez Perce Co

Notes:
Most IL county roads are marked with a both a number and a letter
Blue pentagons are sometimes used, but a numbered/letted blade is much more common
Rock Island County uses single/double letters instead of CR numbers

Lee Co

Hamilton Co

Mason Co

Rock Island Co

Notes:
Blue pentagons are only used on I-80

Elkhart Co

Notes:
Iowa uses blue pentagons in every county except Polk County
CRs use an alpha-numeric grid pattern based on location

Blackhawk Co

Johnson Co

Sioux Co

Winnebago Co

Notes:
Louisiana has Parish Roads instead of County Roads
The bottom text of signs will be "Parish" instead of "County"
T-intersections are generally marked with an arrow between two yellow/black stripes

Lincoln Parish

Caddo Parish

T-intersection marking

Notes:
Michigan uses both numbered County Roads and Intercounty highways
Intercounty highways are preceded by a letter based on state region
Older white squares do exist, but they are very rare or in gen 1 coverage
Michigan shield are more worn the farther north you go

Allegan Co

Delta Co

Otsego Co

Schoolcraft Co

Notes:
Minnesota has an even distribution of blue pentagons and white squares
MN also has an "inter-county" system marked by single letters A to J
Diagonal braces can be used to identify Minnesota, when present

Dakota Co

Ramsey Co

Todd Co

Watonwan Co

Notes:
CR numbers are generally 3-digit and 4-digit, but some are 2-digit
Most of the northwest does not have CR coverage

Lafayette Co

Lee Co

Oxford Co

Notes:
Lettered county roads use white boxes with black borders
Numbered county roads use blue pentagons, but many don't have coverage
Missouri uses Farm Road (FR) in Greene, Barry, and Lawrence counties

Barry Co

Mississippi Co

St. Louis Co

Stone Co

Notes:
Only Clark County uses blue pentagons, the rest are unsigned

Clark Co

Notes:
New Jersey county roads are almost always in the 500s/600s/700s/800s
Bergen Co and Monmouth Co have a couple of CRs in the 100s

New Jersey

Notes:
Some counties use green squares, some use blue pentagons
Schenectady Co uses a large sign with both local name and CR number
Ontario Co signs have the "RD" in a smaller font than the number

Franklin Co

Ontario Co

Schenectady Co

Notes:
North Carolina does not have county roads, but Charlotte has city routes

Charlotte, NC

Bottineau Co

Mercer Co

Steele Co

Notes:
Ashland Co has TWPs instead of CRs
Ohio has the greatest variation of signage, some examples are shown below
Click here to see the full state map.