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ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — ZIP/51246

51246

ZIP 51246 is Rock Rapids, Iowa, in Lyon County; area code 712; Central time.

Type
Standard
Time zone
America/Chicago
County
Lyon
Metro area
none
Population
4,041
Coordinates
43.4288, -96.1647
☼ Live from 51246 — Rock Rapids, IA

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Local time: —

Where 51246 is

Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.

★ Weird and wonderful facts about 51246
  • 🔢 Type 51246 into a pocket calculator and turn it upside down: ghZIS — not quite a word, sorry.
  • ➕ As a number, 51,246 = 2 × 3 × 3 × 3 × 13 × 73. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1100100000101110
  • 🏠 Its numerical neighbours: 51245 (Primghar, IA, 37 mi away) and 51247 (Rock Valley, IA, 18 mi away).
  • 🔄 Backwards, 51246 becomes 64215, which is not a ZIP code at all.
  • 👥 57 other ZIP codes are made of exactly the same digits (12456, 12465, 12546, 12564, 14265, 14526, …). The farthest-flung twin is 12564 in Pawling, NY, 1,154 miles away.
  • 🧭 Farther north than 85% of all ZIP codes, and farther west than 72%.
  • 🎯278 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 51246 and you would come out at 43.43°S, 83.84°E — 765 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 25m of daylight. Shortest: 8h 57m.
  • 📏 At 161.1 square miles of land, 51246 is bigger than 88% of ZIP codes — room for about 122 Central Parks.
🌙 The sky over 51246 today
  • Working out the sun…
🌋 Shake report
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Source: USGS.

People and housing

Population4,041This ZIP4,041
Households1,330This ZIP1,330
Housing units1,555This ZIP1,555
Median age38.0This ZIP38.0Iowa38.6US 38.9
Median household income$72,400This ZIP$72,400Iowa$75,059US $80,734
Median home value$247,900This ZIP$247,900Iowa$208,000US $332,700
Median gross rent$812This ZIP$812Iowa$972US $1,413
Bachelor's degree or higher22.7%This ZIP22.7%
Mean commute13.4 minThis ZIP13.4 min
Population density25.1 / sq miThis ZIP25.1 / sq mi

Business and tax activity

Business establishments147This ZIP147
Employees1,570This ZIP1,570
Annual payroll$89,816,000This ZIP$89,816,000
Tax returns filed1,680This ZIP1,680
Total adjusted gross income$157,609,000This ZIP$157,609,000

Land area

Land area161.11 sq miThis ZIP161.11 sq mi
Water area0.06 sq miThis ZIP0.06 sq mi

Other place names in 51246

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 51246

ZIPCityDistance
56173 Steen, MN 7.7 mi
51242 Lester, IA 8.7 mi
56129 Ellsworth, MN 9.3 mi
51230 Alvord, IA 9.4 mi
51235 Doon, IA 9.6 mi
51237 George, IA 10.4 mi
56146 Kanaranzi, MN 10.9 mi
56138 Hills, MN 13.1 mi
51243 Little Rock, IA 13.5 mi
56158 Magnolia, MN 14.7 mi

Find every ZIP code within 10 miles of 51246 →

Questions about this ZIP code

Where is ZIP code 51246?

51246 is in Rock Rapids, Iowa, in Lyon County. Its published point location is 43.4288, -96.1647.

What county is 51246 in?

51246 lies in Lyon County.

What area code is 51246?

Rock Rapids uses area code 712, from NANPA's telephone records.

What time zone is 51246 in?

51246 uses America/Chicago.

How many people live in 51246?

About 4,041 people live in ZIP code 51246, in 1,330 households, at 25.1 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What is the median household income in 51246?

$72,400 a year, against $75,059 across Iowa.

What ZIP codes are near 51246?

The closest are 56173 (7.7 mi), 51242 (8.7 mi), 56129 (9.3 mi), 51230 (9.4 mi) and 51235 (9.6 mi).

Is 51246 a PO Box ZIP code?

51246 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “51246 ZIP Code — Rock Rapids, Iowa (Lyon County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51246

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