Front Plate Required: Yes
Area Codes: 262, 414, 608, 715, 920
License Plates:
Windshield Stickers:
Road and Highway Signs:
County Roads:
Highways:
Highway Adoption:
Historical:
Wisconsin can range anywhere from cornfields to conifer forests. The standard license plate is white, but a lot of state-owned signs have a triangle sticker on the back.
Cornfield and broadleaf forest
Cornfield and conifer mix
WisDOT triangle sticker
Wisconsin has some unique types of address signs and bridge marker. Bridges with concrete barriers have a small plaque, but they can be hard to spot, even if you're looking for them.
Green address marker
Red address marker
Bridge plaque
County roads are marked with one or two letters instead of numbers, but combinations can be repeated across different counties. Most signs are mounted on thick wooden posts, and ATV and snowmobile routes are marked in green. Stop signs might say "All Way" or "Cross traffic doesn't stop", but will never say "2-way", "3-way", or "4-way".
Lettered county road and ATV route
Snowmobile route
Unmarked stop sign
Missouri also marks its county roads with letters, but has a thick black edge on all four borders.
Wisconsin
New Hampshire also has ATV routes.
Wisconsin
Thanks to Ben Keller for pointing out the green address signs and Apollobo for the info about them.
More thanks to Apollobo for the Wisconsin fact checking.