ZIP code 51101
Where is ZIP code 51101?
Sioux City, Iowa
Woodbury County · Standard ZIP code
ZIP code 51101 belongs to Sioux City, Iowa in Woodbury County. 51101 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 1,031 people live in the 51101 area, where the median household income is $15,300. The closest ZIP codes are 51105 (Sioux City, 1.1 mi east), 51103 (Sioux City, 1.5 mi northwest) and 51104 (Sioux City, 2 mi north).
| ZIP code | 51101 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Sioux City |
| State | Iowa (IA) |
| County | Woodbury County |
| Time zone | Central Time · now |
| Area code | 712 |
| Coordinates | 42.4972, -96.4029 map |
| 3-digit prefix | 511 |
Population and income in 51101
| Population | 1,031 · higher than 53% of Iowa ZIP codes |
|---|---|
| People per square mile | 857 · higher than 93% of Iowa ZIP codes |
| Median age | 40.8 years · lower than 62% of Iowa ZIP codes |
| Men / women | 58% / 42% |
| Median household income | $15,300 · lower than 100% of Iowa ZIP codes |
| Income per person | $21,580 |
| Below the poverty line | 48% |
| Bachelor’s degree or higher | 11% of adults 25+ |
| Median rent | $708 a month |
| Housing units | 788 |
| Households | 640 (1.26 people on average) |
| Owners / renters | 3.4% / 97% |
| Land area | 1.2 sq mi (plus 0.02 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 51101. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 51101
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 51105 | Sioux City, IA | 1.1 mi E | Standard |
| 51103 | Sioux City, IA | 1.5 mi NW | Standard |
| 51104 | Sioux City, IA | 2 mi N | Standard |
| 68776 | South Sioux City, NE | 2.3 mi S | Standard |
| 51106 | Sioux City, IA | 3.3 mi SE | Standard |
| 51108 | Sioux City, IA | 4 mi NE | Standard |
| 51109 | Sioux City, IA | 4.2 mi W | Standard |
| 57049 | North Sioux City, SD | 5.7 mi W | Standard |
| 51111 | Sioux City, IA | 6.3 mi S | Standard |
| 51054 | Sergeant Bluff, IA | 7.1 mi S | Standard |
| 68731 | Dakota City, NE | 8.5 mi S | Standard |
| 51024 | Hinton, IA | 8.9 mi NE | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 51101 or measure the distance to another ZIP code.
How to address mail to 51101
123 MAIN ST
SIOUX CITY IA 51101
Put the city, the two-letter state code and the ZIP code on the last line. Avoid Wickham Spur: USPS doesn’t recognize it as the city for this ZIP code. Adding the 4-digit ZIP+4 code (51101-XXXX) helps mail sort faster but isn’t required.
Other ZIP codes in Sioux City, IA
All Sioux City ZIP codes with population and income →
Questions
- What city is ZIP code 51101?
- 51101 is a Sioux City, Iowa ZIP code.
- What county is 51101 in?
- ZIP code 51101 is in Woodbury County, Iowa.
- What time zone is ZIP code 51101 in?
- 51101 is in the Central Time zone (America/Chicago).
- What area code is 51101?
- Phone numbers in ZIP code 51101 use area code 712.
- What is the population of ZIP code 51101?
- About 1,031 people live in ZIP code 51101, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 51101?
- The median household income in 51101 is $15,300 a year, lower than 100% of Iowa ZIP codes.
- What ZIP codes are near 51101?
- The nearest ZIP codes to 51101 are 51105 (Sioux City, 1.1 miles), 51103 (Sioux City, 1.5 miles), 51104 (Sioux City, 2 miles) and 68776 (South Sioux City, 2.3 miles).