Residential delivery area · Maine
ZIP Code 04858: South Thomaston, ME
ZIP code 04858 uses the postal name South Thomaston, Maine and lies entirely in Knox County (Census 2020 ZIP-county file). About 1,400 people live there (Census Bureau, ACS 2020-2024). Median household income is $87,059 (Census Bureau, ACS 2020-2024). Its land lies outside any incorporated or census-designated place.
- ACS2020-24
- Census2020
- FHFA2022
- ZBP2023
- IRS2022
- Town
- South Thomaston · its only residential ZIP
- County
- Knox County
- House district
- ME-1 119th Congress
- State
- Maine
- Time zone
- Eastern
- Land area
- 11.4 sq mi · 121 people per sq mi
Where is ZIP code 04858?
04858 centers on 44.047°, -69.154° and covers 11.4 square miles of land plus 3.2 of water. It borders 6 ZIP codes: 04854, 04859, 04861, 04563, 04841, 04860.
The map draws ZIP code areas only. For the streets inside 04858, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 04858 compare with the rest of Knox County?
| Measure | 04858 | In Knox County | In ME |
|---|---|---|---|
| People (ACS 2020-2024) | 1,378 | 12th of 19 | 227th of 426 |
| Median household income | $87k | 2nd of 11 | 51st of 200 |
| Median home value | $341k | 7th of 13 | 65th of 242 |
Its median household income is higher than in 70% of U.S. residential ZIP codes, and it is denser than 56% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 04858?
The 2020 Census counted 1,497 people in 04858; the ACS, which samples households over 2020-2024, estimates 1,378. Between the 2010 and 2020 censuses its population fell 2.3% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 1,378±260 (90% margin)
- 2020 Census count
- 1,497−2.3% since 2010 (1,533)
- Households
- 608
- Median age
- 54.1
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 04858?
Of the 1,378 people the ACS estimates in 04858, 13.9% are under 18 and 34.8% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (96.9%).
- Under 1813.9%
- 18 to 6451.3%
- 65 and older34.8%
- White, not Hispanic96.9%
- Other or two or more3.1%
- Hispanic or Latino0.0%
- Black, not Hispanic0.0%
- Asian, not Hispanic0.0%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 04858 earn?
Median household income is $87,059 (ACS 2020-2024), the 2nd highest of the 11 ranked ZIP codes in Knox County. It is not measurably different from 2015-2019 ($83,973 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $87,059
- Income per person
- $47,373
- Below the poverty line
- 4.2%
- Unemployed (of the labor force)
- 0.0%
- Adults 25+ with a bachelor's degree
- 44.4%
- Adjusted gross income per tax return, 2022
- $65,804800 returns; wages 60% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 04858?
- Median home value (owners' estimate)
- $341,300
- Median gross rent
- $925
- Homes owned by their occupants
- 92.9%
- Housing units
- 809
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 04858?
41 business establishments had a location in this ZIP code in 2023, 2 more than in 2018; the most are in agriculture, forestry, fishing and hunting (ZIP Code Business Patterns).
- Agriculture, forestry, fishing and hunting13
- Construction6
- Professional, scientific, and technical services6
- Other services (except public administration)3
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 04858?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 04854 | Owls Head | 1,482 | $87k | 3.1 mi |
| 04859 | Spruce Head | 753 | $75k | 3.5 mi |
| 04861 | Thomaston | 2,769 | $56k | 4.3 mi |
| 04563 | Cushing | 1,460 | $84k | 5.7 mi |
| 04841 | Rockland | 7,035 | $57k | 6.1 mi |
| 04860 | Tenants Harbor | 1,543 | $87k | 8.3 mi |
| 04864 | Warren | 4,932 | $75k | 7.2 mi (near) |
| 04856 | Rockport | 3,675 | $87k | 9.4 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.