Residential delivery area · Idaho
ZIP Code 83440: Rexburg, ID
ZIP code 83440 uses the postal name Rexburg, Idaho and lies mostly in Madison County (96% of its land) with the rest in Fremont County (Census 2020 ZIP-county file). About 51,000 people live there (Census Bureau, ACS 2020-2024), the more populous of Rexburg's 2 residential ZIP codes. Median household income is $58,159 (Census Bureau, ACS 2020-2024). By Census place, 5% of its land lies in Rexburg; 95% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Rexburg · 2 residential ZIPs
- County
- Madison County (96%); Fremont County (4%)
- Census places
- Rexburg
- Micro area
- Rexburg, ID
- House district
- ID-2 119th Congress
- State
- Idaho
- Time zone
- Mountain
- Land area
- 181.7 sq mi · 283 people per sq mi
- PO Box ZIPs
- 83441 also use the name Rexburg
Where is ZIP code 83440?
83440 centers on 43.809°, -111.809° and covers 181.7 square miles of land plus 3.1 of water. It borders 8 ZIP codes: 83460, 83448, 83451, 83434, 83442, 83445, 83436, 83443.
The map draws ZIP code areas only. For the streets inside 83440, 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 83440 compare with the rest of Rexburg?
| Measure | 83440 | In Rexburg | In Madison County | In ID |
|---|---|---|---|---|
| People (ACS 2020-2024) | 51,421 | 1st of 2 | 1st of 7 | 7th of 279 |
| Median household income | $58k | 1st of 1 | 3rd of 3 | 114th of 126 |
| Median home value | $419k | 1st of 1 | 1st of 3 | 48th of 138 |
Its median household income is higher than in 26% of U.S. residential ZIP codes, and it is denser than 66% 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 83440?
The 2020 Census counted 50,567 people in 83440; the ACS, which samples households over 2020-2024, estimates 51,421. Between the 2010 and 2020 censuses its population grew 46.1% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 51,421
- 2020 Census count
- 50,567+46.1% since 2010 (34,610)
- Households
- 12,426
- Median age
- 21.3
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 83440?
Of the 51,421 people the ACS estimates in 83440, 19.6% are under 18 and 4.9% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (83.5%).
- Under 1819.6%
- 18 to 6475.5%
- 65 and older4.9%
- White, not Hispanic83.5%
- Hispanic or Latino9.8%
- Other or two or more4.2%
- Asian, not Hispanic1.6%
- Black, not Hispanic1.0%
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 83440 earn?
Median household income is $58,159 (ACS 2020-2024), the 3rd highest of the 3 ranked ZIP codes in Madison County. It rose from $46,815 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $58,159±$6,248
- Income per person
- $23,661
- Below the poverty line
- 25.8%
- Unemployed (of the labor force)
- 7.8%
- Adults 25+ with a bachelor's degree
- 40.9%
- Adjusted gross income per tax return, 2022
- $58,88814,760 returns; wages 68% 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 83440?
FHFA's house price index for 83440, built from repeat sales and appraisals of the same homes, rose 115% from 2015 to 2025 and rose 53% from 2020 to 2025, and moved +1.3% in 2025.
- Median home value (owners' estimate)
- $419,300
- Median gross rent
- $1,000
- Homes owned by their occupants
- 38.5%
- Housing units
- 14,120
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 83440?
1,046 business establishments had a location in this ZIP code in 2023, 129 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction172
- Retail trade147
- Health care and social assistance138
- Professional, scientific, and technical services100
- Accommodation and food services76
- Real estate and rental and leasing70
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 83440?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 83460 | Rexburg | 56 | – | 1.4 mi |
| 83448 | Sugar City | 3,365 | $76k | 5.6 mi |
| 83451 | Teton | 993 | $68k | 9.6 mi |
| 83434 | Menan | 1,816 | $83k | 10.5 mi |
| 83442 | Rigby | 25,609 | $88k | 12.5 mi |
| 83445 | Saint Anthony | 7,975 | $68k | 16.1 mi |
| 83436 | Newdale | 778 | $80k | 18.1 mi |
| 83443 | Ririe | 1,364 | $66k | 23.2 mi |
| 83438 | Parker | 327 | $146k | 10.7 mi (near) |
| 83431 | Lewisville | 1,045 | $91k | 13.9 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.