ZIP code 51003
Where is ZIP code 51003?
Alton, Iowa
Sioux County · Standard ZIP code
ZIP code 51003 belongs to Alton, Iowa in Sioux County. 51003 is a standard ZIP code, so it covers street addresses as well as PO Boxes. It is in the Central Time zone and uses area code 712. About 1,938 people live in the 51003 area, where the median household income is $101,250. The closest ZIP codes are 51041 (Orange City, 3.4 mi northwest), 51022 (Granville, 6.1 mi east) and 51036 (Maurice, 7.6 mi west).
| ZIP code | 51003 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Alton |
| State | Iowa (IA) |
| County | Sioux County |
| Time zone | Central Time · now |
| Area code | 712 |
| Coordinates | 42.9782, -96.0173 map |
| 3-digit prefix | 510 |
Population and income in 51003
| Population | 1,938 · higher than 70% of Iowa ZIP codes |
|---|---|
| People per square mile | 36 · higher than 65% of Iowa ZIP codes |
| Median age | 37.1 years · lower than 81% of Iowa ZIP codes |
| Men / women | 51% / 49% |
| Median household income | $101,250 · higher than 89% of Iowa ZIP codes |
| Income per person | $44,417 |
| Below the poverty line | 2.0% |
| Bachelor’s degree or higher | 29% of adults 25+ |
| Median home value | $232,700 · higher than 82% of Iowa ZIP codes |
| Median rent | $813 a month |
| Housing units | 788 |
| Households | 730 (2.65 people on average) |
| Owners / renters | 87% / 13% |
| Land area | 54.35 sq mi (plus 0.03 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 51003. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 51003
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 51041 | Orange City, IA | 3.4 mi NW | Standard |
| 51022 | Granville, IA | 6.1 mi E | Standard |
| 51036 | Maurice, IA | 7.6 mi W | Standard |
| 51238 | Hospers, IA | 8.7 mi NE | Standard |
| 51250 | Sioux Center, IA | 10.9 mi NW | Standard |
| 51045 | Oyens, IA | 11.1 mi S | PO Box only |
| 51050 | Remsen, IA | 11.7 mi S | Standard |
| 51031 | Le Mars, IA | 14.8 mi SW | Standard |
| 51035 | Marcus, IA | 15.4 mi SE | Standard |
| 51027 | Ireton, IA | 15.5 mi W | Standard |
| 51046 | Paullina, IA | 15.6 mi E | Standard |
| 51234 | Boyden, IA | 15.7 mi N | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 51003 or measure the distance to another ZIP code.
How to address mail to 51003
123 MAIN ST
ALTON IA 51003
Put the city, the two-letter state code and the ZIP code on the last line. Avoid Carnes: USPS doesn’t recognize it as the city for this ZIP code. Adding the 4-digit ZIP+4 code (51003-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 51003?
- 51003 is a Alton, Iowa ZIP code.
- What county is 51003 in?
- ZIP code 51003 is in Sioux County, Iowa.
- What time zone is ZIP code 51003 in?
- 51003 is in the Central Time zone (America/Chicago).
- What area code is 51003?
- Phone numbers in ZIP code 51003 use area code 712.
- What is the population of ZIP code 51003?
- About 1,938 people live in ZIP code 51003, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 51003?
- The median household income in 51003 is $101,250 a year, higher than 89% of Iowa ZIP codes.
- What ZIP codes are near 51003?
- The nearest ZIP codes to 51003 are 51041 (Orange City, 3.4 miles), 51022 (Granville, 6.1 miles), 51036 (Maurice, 7.6 miles) and 51238 (Hospers, 8.7 miles).