Residential delivery area · Idaho
ZIP Code 83420: Ashton, ID
ZIP code 83420 uses the postal name Ashton, Idaho and lies entirely in Fremont County (Census 2020 ZIP-county file). About 2,600 people live there (Census Bureau, ACS 2020-2024). Median household income is $69,286 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Ashton (under 1%), Warm River (under 1%) and Drummond (0%); more than 99% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Ashton · its only residential ZIP
- County
- Fremont County
- Census places
- Ashton (under 1%); Warm River (under 1%); Drummond (0%)
- Micro area
- Rexburg, ID
- House district
- ID-2 119th Congress
- State
- Idaho
- Time zone
- Mountain
- Land area
- 410.8 sq mi · 6 people per sq mi
Where is ZIP code 83420?
83420 centers on 44.059°, -111.325° and covers 410.8 square miles of land plus 4.3 of water. It borders 7 ZIP codes: 83421, 83424, 83436, 83452, 83445, 83414, 83429.
The map draws ZIP code areas only. For the streets inside 83420, 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 83420 compare with the rest of Fremont County?
| Measure | 83420 | In Fremont County | In ID |
|---|---|---|---|
| People (ACS 2020-2024) | 2,580 | 4th of 11 | 95th of 279 |
| Median household income | $69k | 1st of 3 | 81st of 126 |
| Median home value | $338k | 3rd of 4 | 80th of 138 |
Its median household income is higher than in 46% of U.S. residential ZIP codes, and it is denser than 12% 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 83420?
The 2020 Census counted 2,445 people in 83420; the ACS, which samples households over 2020-2024, estimates 2,580. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 2,580±428 (90% margin)
- 2020 Census count
- 2,445
- Households
- 990
- Median age
- 49.4
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 83420?
Of the 2,580 people the ACS estimates in 83420, 16.8% are under 18 and 25.3% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (87.8%).
- Under 1816.8%
- 18 to 6457.9%
- 65 and older25.3%
- White, not Hispanic87.8%
- Hispanic or Latino9.9%
- Other or two or more2.0%
- Black, not Hispanic0.4%
- 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 83420 earn?
Median household income is $69,286 (ACS 2020-2024), the highest of the 3 ranked ZIP codes in Fremont County.
- Median household income
- $69,286±$9,836
- Income per person
- $42,560
- Below the poverty line
- 5.3%
- Unemployed (of the labor force)
- 3.0%
- Adults 25+ with a bachelor's degree
- 29.0%
- Adjusted gross income per tax return, 2022
- $71,0481,220 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 83420?
FHFA's house price index for 83420, built from repeat sales and appraisals of the same homes, rose 148% from 2015 to 2025 and rose 62% from 2020 to 2025, and moved +3.0% in 2025.
- Median home value (owners' estimate)
- $337,700
- Median gross rent
- $1,025
- Homes owned by their occupants
- 88.5%
- Housing units
- 1,326
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 83420?
89 business establishments had a location in this ZIP code in 2023, 11 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction25
- Retail trade14
- Accommodation and food services13
- Health care and social assistance6
- Transportation and warehousing5
- Other services (except public administration)5
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 83420?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 83421 | Chester | 220 | – | 11.7 mi |
| 83424 | Felt | 168 | $151k | 12.6 mi |
| 83436 | Newdale | 778 | $80k | 14.8 mi |
| 83452 | Tetonia | 2,237 | $72k | 20.0 mi |
| 83445 | Saint Anthony | 7,975 | $68k | 20.9 mi |
| 83414 | Alta, WY | 502 | – | 23.7 mi |
| 83429 | Island Park | 628 | $79k | 29.3 mi |
| 83451 | Teton | 993 | $68k | 20.3 mi (near) |
| 83438 | Parker | 327 | $146k | 22.7 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.