49240 ZIP Code, Grass Lake, MI
49240 is a ZIP code in Grass Lake, Michigan — mostly in Jackson County (85% of its land), with smaller parts in Washtenaw County. It covers 104 square miles of land. The closest ZIP codes are 48118, 49263 and 49254. 8,863 people live here in 3,629 households. It is rural, with fewer than 100 people per square mile, and most homes are owner-occupied (93%). Median household income is $99,681, above the Michigan median of $72,875; the median age is 46.8, older than most ZIP codes.
Quick facts
- Mailing city: Grass Lake, MI
- County: Jackson County
- Land area: 104 sq mi
- Population: 8,863
- Median household income: $99,681
- Carrier routes: 7 (3,760 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 8,863 |
| Households | 3,629 |
| Median household income | $99,681 |
| Income per person | $50,282 |
| Median age | 46.8 |
| Homeowners | 92.6% |
| Median home value | $298,700 |
| Median rent | $1,135 |
| Bachelor's degree or higher | 31.9% |
| Average commute (minutes) | 26.3 |
| Households with kids under 18 | 23.3% |
| Moved in the past year | 5.8% |
| Below the poverty line | 4.2% |
| Broadband internet | 92.4% |
| Speak a non-English language at home | 2.0% |
Household income
| % of households | Value |
|---|---|
| <$10K | 1.2% |
| $10–15K | 2.0% |
| $15–25K | 2.0% |
| $25–35K | 4.1% |
| $35–50K | 9.0% |
| $50–75K | 19.3% |
| $75–100K | 12.8% |
| $100–150K | 21.9% |
| $150–200K | 13.6% |
| $200K+ | 14.2% |
Age
| % of all residents | Value |
|---|---|
| <10 | 9.8% |
| 10–19 | 10.5% |
| 20–24 | 4.4% |
| 25–34 | 11.9% |
| 35–44 | 12.1% |
| 45–54 | 13.4% |
| 55–64 | 15.4% |
| 65–74 | 14.4% |
| 75+ | 8.2% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 53.6% |
| Owned outright | 32.5% |
| Rented | 6.8% |
| Vacant | 7.1% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 89.9% |
| Townhome | 1.5% |
| 2–4 units | 3.9% |
| 5–19 units | 1.0% |
| 20+ units | 0.0% |
| Mobile / other | 3.7% |
Businesses in 49240
129 business establishments with 1,328 employees (ZIP Codes Business Patterns 2023).
- Construction: 28
- Other Services (except Public Administration): 15
- Professional, Scientific, and Technical Services: 14
- Health Care and Social Assistance: 14
- Retail Trade: 10
- Accommodation and Food Services: 10
- Manufacturing: 8
- Wholesale Trade: 7
EDDM carrier routes
49240 has 7 USPS carrier routes with 3,760 residential and 69 business mailboxes. Open the EDDM route map.
Carrier routes in 49240
49240 has 7 USPS carrier routes (7 rural (R)) with 3,760 residential and 69 business mailboxes. Routes range from 490 homes (R044) to 601 homes (R046); the median route has 537 homes. The Census counted 3,629 households in 49240 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 2 |
| 500–749 | 5 |
| 750–999 | 0 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 49240 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route R045 — USPS business mailboxes 14, 537 homes
- Route R042 — USPS business mailboxes 13, 537 homes
- Route R041 — USPS business mailboxes 12, 519 homes
- Route R044 — USPS business mailboxes 11, 490 homes
- Route R043 — USPS business mailboxes 10, 583 homes
Select these 5 routes on the route map
Every carrier route in 49240
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| R041 | Rural | 519 | 12 | $83,888 | — | — | — |
| R042 | Rural | 537 | 13 | $49,454 | — | — | — |
| R043 | Rural | 583 | 10 | $83,987 | — | — | — |
| R044 | Rural | 490 | 11 | $83,183 | — | — | — |
| R045 | Rural | 537 | 14 | $83,888 | — | — | — |
| R046 | Rural | 601 | 5 | $53,125 | — | — | — |
| R047 | Rural | 493 | 4 | $83,987 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 49240 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
- 48118 — Chelsea city, MI (7.9 mi)
- 49263 (7.9 mi)
- 49254 — Michigan Center CDP, MI (8 mi)
- 49261 — Napoleon CDP, MI (8.3 mi)
- 49259 (8.6 mi)
- 48158 — Manchester village, MI (11.1 mi)
- 49202 — Jackson city, MI (11.8 mi)
- 49203 — Jackson city, MI (11.9 mi)
Areas that include 49240
- Grass Lake, MI ZIP codes — 1 ZIP code
- Jackson County ZIP codes — 22 ZIP codes
- Washtenaw County ZIP codes — 22 ZIP codes
- Michigan ZIP code data
Where it ranks
- No. 3 of 20: highest median household income in Jackson County
- No. 1 of 20: highest median home value in Jackson County
- No. 4 of 20: highest share of owner-occupied homes in Jackson County
- No. 6 of 20: highest median age in Jackson County
Mail every home in 49240
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) 49240, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 49240 in?
- 49240 is a Grass Lake, MI mailing address. None of its land lies inside a Census-defined city or community.
- What county is 49240 in?
- 49240 is mostly in Jackson County (85% of its land), with smaller parts in Washtenaw County.
- What is the population of 49240?
- About 8,863 people (±525), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 9,213.
- What is the median household income in 49240?
- $99,681 (±$9,369), 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 49240?
- 7 USPS carrier routes with 3,760 residential and 69 business mailboxes (3,829 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 49240?
- The closest, measured center to center: 48118 (7.9 mi, Chelsea), 49263 (7.9 mi), 49254 (8 mi, Michigan Center), 49261 (8.3 mi, Napoleon), 49259 (8.6 mi) and 48158 (11.1 mi, Manchester).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.