911 Address Sign Requirements: Size, Color and Placement

911 address sign requirements are set locally, so the same house number can need a different sign one county over. The model International Fire Code asks for address numbers that contrast with their background, are at least 4 inches high with a stroke of at least half an inch, and can be seen from the street. Counties add their own size, color, reflectivity and mounting rules, and some issue the sign. Check with your county 911 or addressing office before you buy or make anything.

What the model fire code says

The 2021 and 2024 editions of IFC 505.1 ask for address characters that contrast with the background, written as Arabic numbers or letters and not spelled out, legible and placed where they are visible from the street or road fronting the property. Where a private road keeps a building out of view from the public way, a monument, pole or other sign should identify it. The International Residential Code uses the same character size for homes (section R308.1 in 2024).

The code does not name a sign color, say numbers must be reflective, or set a sign size, mounting height or double-sided rule. It applies only where a state or local government has adopted it, and counties differ. Goodhue County, Minnesota says emergency numbers must conform to building code requirements, yet its own document lists 3 inches.

Address number size requirements by county

These examples come from official county, town and township pages.

• Goodhue County, MN: numbers of at least 3 inches with a stroke of at least half an inch, on a red reflective sign with the county address strip. The county sells the sign (county document, 2018).
• Morrison County, MN: white numbers on a blue reflective sign, with numbers on both sides, prepared and put up by the county. The version we read dates from 2007, so confirm the current one (ordinance).
• Llano County, TX: reflective numbers of at least 3 inches. For a fee the county makes a red reflective sign, pick-up only (county PDF).
• Madison County, TX: reflective numbers of at least 4 inches on a background that should not be reflective. You may provide your own sign or ask the office for one (mounting tips).
• Phelps County, MO: a 6 by 18 inch sign, red on both faces, with white reflective numbers of 3 inches, mounted at least 24 inches off the ground. Owners post it themselves (county page).
• Town of Clinton, WI: red with white copy, fully reflective, numbers of at least 4 inches, double-sided. Signs and posts stay town property (town ordinance).
• Ransom Township, PA: white reflective lettering of 3 inches on a green sign 6 by 18 inches, in durable coated metal or plastic on a permanent post (township ordinance).
• North Carolina: Wake County asks for at least 4 inches at single-family homes and 6 inches at multi-family homes. Madison County asks for at least 3 inches at homes and 6 inches at businesses.

911 address sign color and reflective numbers

Colors are not uniform. Among the pages above, signs are red (Goodhue, Phelps, Clinton), blue (Morrison) or green (Ransom), and Nottoway County, Virginia refers to brown house markers. Use the color your county or fire district names.

The model code asks for contrast, not reflectivity, yet many counties ask for reflective numbers so responders can read them at night. Wake County accepts numbers visible in the dark under a light, reflective, or on a high contrast background. Madison County, TX wants reflective figures on a background that is not reflective.

Counties that issue their own sign

Goodhue and Morrison counties issue the sign, and the Town of Clinton keeps ownership of its signs. A decal cannot replace those. Madison County, TX lets you provide your own. Llano County sells signs without saying whether one you make is accepted, so call and ask.

Placement tips from official pages

• Visible from the road. Wake County asks for numbers on a mailbox, post or sign at the end of the driveway, clear of bushes and vines.
• Height varies. Goodhue sets signs 3 to 5 feet up and 4 to 10 feet from the road. Clinton sets them 4 to 5 feet up and 5 to 15 feet from the road. Phelps asks for at least 24 inches off the ground.
• Both directions. Floyd County, Virginia asks that numbers be visible from the driveway entrance and from both directions. Morrison and Clinton ask for numbers on both sides.
• Mailboxes. Madison County, NC allows numbers on both sides of a mailbox that is the only one in front of the house. Ransom does not accept them in place of a sign.

Making your own sign with a decal

If your county lets you supply the sign, a reflective decal on your own blank is one way to do it. On our reflective address number decals page you type the house number, pick 3, 4 or 6 inch numbers and a horizontal or vertical layout, and add an optional small second line on horizontal ones. Backgrounds are green, blue, red, black or white, and numbers are white, black or yellow. The whole decal is printed on reflective film.

It is a decal, not a finished sign. You apply it to your own clean, flat, rigid sign blank, post or mailbox, and the blank, post and hardware are not included. Price starts at $24.99 per decal, or $44.99 for two, which suits a double-sided sign. Larger sizes cost more by width.

Three cautions. A decal cannot replace a sign your county or town issues. The whole decal is reflective, background included, so it does not suit a county that wants a non-reflective background. And we cannot say what your county accepts, so ask first. For application steps and a look at reflective film, see our guides to installing decals on a truck door, reflective truck lettering and applying boat registration numbers. They are written for trucks and boats, so treat them as general guides. More decals are in the shop.