ZIP code 83421
Where is ZIP code 83421?
Chester, Idaho
Fremont County · PO Box only ZIP code
ZIP code 83421 belongs to Chester, Idaho in Fremont County. 83421 is a PO Box only ZIP code: it is used for post office boxes at the Chester post office, not for street addresses. It is in the Mountain Time zone and uses area codes 208 and 986. About 220 people live in the 83421 area. The closest ZIP codes are 83420 (Ashton, 5.5 mi east), 83436 (Newdale, 8.5 mi southwest) and 83445 (Saint Anthony, 8.8 mi west).
| ZIP code | 83421 |
|---|---|
| Type | PO Box only (no street delivery) |
| Status | Active |
| City | Chester |
| State | Idaho (ID) |
| County | Fremont County |
| Time zone | Mountain Time · now |
| Area codes | 208, 986 |
| Coordinates | 44.0011, -111.5351 map |
| 3-digit prefix | 834 |
Population and income in 83421
| Population | 220 · lower than 83% of Idaho ZIP codes |
|---|---|
| People per square mile | 19 · higher than 56% of Idaho ZIP codes |
| Median age | 62.4 years · higher than 90% of Idaho ZIP codes |
| Men / women | 60% / 40% |
| Income per person | $125,365 |
| Below the poverty line | 0.0% |
| Bachelor’s degree or higher | 7.6% of adults 25+ |
| Median home value | $282,400 · lower than 68% of Idaho ZIP codes |
| Housing units | 148 |
| Households | 115 (1.91 people on average) |
| Owners / renters | 100% / 0.0% |
| Land area | 11.69 sq mi (plus 0.15 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 83421. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 83421
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 83420 | Ashton, ID | 5.5 mi E | Standard |
| 83436 | Newdale, ID | 8.5 mi SW | Standard |
| 83445 | Saint Anthony, ID | 8.8 mi W | Standard |
| 83451 | Teton, ID | 9.5 mi SW | Standard |
| 83438 | Parker, ID | 11.4 mi W | PO Box only |
| 83448 | Sugar City, ID | 13.2 mi SW | Standard |
| 83441 | Rexburg, ID | 17.4 mi SW | Unique |
| 83460 | Rexburg, ID | 17.5 mi SW | Unique |
| 83440 | Rexburg, ID | 18.3 mi SW | Standard |
| 83424 | Felt, ID | 19.4 mi SE | Standard |
| 83452 | Tetonia, ID | 22.1 mi SE | Standard |
| 83422 | Driggs, ID | 28.1 mi SE | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 83421 or measure the distance to another ZIP code.
How to address mail to 83421
PO BOX 123
CHESTER ID 83421
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (83421-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 83421?
- 83421 is a Chester, Idaho ZIP code.
- What county is 83421 in?
- ZIP code 83421 is in Fremont County, Idaho.
- What time zone is ZIP code 83421 in?
- 83421 is in the Mountain Time zone (America/Boise).
- What area code is 83421?
- Phone numbers in ZIP code 83421 use area codes 208 and 986.
- What is the population of ZIP code 83421?
- About 220 people live in ZIP code 83421, according to the Census Bureau’s American Community Survey (2020–2024).
- Can I use 83421 for a street address?
- No. 83421 is only for PO Boxes. Street addresses in Chester use another ZIP code.
- What ZIP codes are near 83421?
- The nearest ZIP codes to 83421 are 83420 (Ashton, 5.5 miles), 83436 (Newdale, 8.5 miles), 83445 (Saint Anthony, 8.8 miles) and 83451 (Teton, 9.5 miles).