48134 ZIP Code, Flat Rock, MI

48134 is a ZIP code in Flat Rock, Michigan — mostly in Wayne County (85% of its land), with smaller parts in Monroe County. It covers 19 square miles of land. The closest ZIP codes are 48183, 48173 and 48179. 23,935 people live here in 9,146 households. At about 1,291 people per square mile it has suburban density, and most homes are owner-occupied (84%). Median household income is $92,076, above the Michigan median of $72,875.

Quick facts

Key figures

MeasureValue
Residents23,935
Households9,146
Median household income$92,076
Income per person$41,927
Median age40.8
Homeowners84.3%
Median home value$276,100
Median rent$1,088
Bachelor's degree or higher31.4%
Average commute (minutes)26.1
Households with kids under 1828.9%
Moved in the past year6.7%
Below the poverty line9.1%
Broadband internet92.6%
Speak a non-English language at home3.7%

Household income

% of householdsValue
<$10K3.0%
$10–15K2.9%
$15–25K4.4%
$25–35K6.7%
$35–50K12.2%
$50–75K11.7%
$75–100K13.4%
$100–150K21.0%
$150–200K13.1%
$200K+11.7%

Age

% of all residentsValue
<1012.9%
10–1912.4%
20–245.6%
25–3412.1%
35–4411.6%
45–5413.8%
55–6414.6%
65–7410.1%
75+6.8%

Tenure

% of housing unitsValue
Owned, with mortgage52.3%
Owned outright29.8%
Rented15.1%
Vacant2.8%

Type of building

% of housing unitsValue
Detached house67.0%
Townhome5.1%
2–4 units3.1%
5–19 units6.3%
20+ units1.2%
Mobile / other17.3%

Businesses in 48134

298 business establishments with 5,914 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

48134 has 15 USPS carrier routes with 9,668 residential and 348 business mailboxes. Open the EDDM route map.

Carrier routes in 48134

48134 has 15 USPS carrier routes (5 city (C), 8 rural (R), 2 highway contract (H)) with 9,668 residential and 348 business mailboxes. Routes range from 212 homes (H001) to 1,119 homes (C005); the median route has 673 homes. The Census counted 9,146 households in 48134 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2492
250–4991
500–7499
750–9992
1,000–1,4991
1,500+0

Best routes in 48134 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

  1. Route C001 — USPS business mailboxes 154, 812 homes
  2. Route R003 — USPS business mailboxes 55, 583 homes
  3. Route R005 — USPS business mailboxes 40, 664 homes
  4. Route C002 — USPS business mailboxes 32, 562 homes
  5. Route C003 — USPS business mailboxes 19, 577 homes

Select these 5 routes on the route map

Every carrier route in 48134

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
C001City812154$71,222———
C002City56232$71,222———
C003City57719$100,480———
C004City7137$115,804———
C005City1,1191$71,222———
H001Highway contract2120$73,478———
H002Highway contract2332$51,754———
R001Rural7451$79,204———
R003Rural58355$115,421———
R004Rural9345$75,886———
R005Rural66440$116,127———
R006Rural6957$116,127———
R007Rural6731$100,309———
R008Rural6937$73,478———
R009Rural45317$115,421———

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 48134 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

Areas that include 48134

Where it ranks

Mail every home in 48134

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 48134, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 48134 in?
48134 is a Flat Rock, MI mailing address. By land area, 33% lies inside Flat Rock; the rest is outside any Census-defined city or community.
What county is 48134 in?
48134 is mostly in Wayne County (85% of its land), with smaller parts in Monroe County.
What is the population of 48134?
About 23,935 people (±1,295), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 23,829.
What is the median household income in 48134?
$92,076 (±$9,274), compared with $72,875 for Michigan as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 48134?
15 USPS carrier routes with 9,668 residential and 348 business mailboxes (10,018 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 48134?
The closest, measured center to center: 48183 (4.4 mi, Trenton), 48173 (4.8 mi, Gibraltar), 48179 (5.4 mi, South Rockwood), 48164 (5.5 mi), 48193 (6.4 mi, Riverview) and 48117 (7 mi, Carleton).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.