Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

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/48631

48631

ZIP 48631 is Kawkawlin, Michigan, in Bay County; area code 989; Eastern time.

Type
Standard
Time zone
America/Detroit
County
Bay
Metro area
Bay City, MI
Population
3,681
Coordinates
43.6886, -83.9959
☼ Live from 48631 — Kawkawlin, MI

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 48631 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 48631
  • 🔢 Type 48631 into a pocket calculator and turn it upside down: IEgBh — not quite a word, sorry.
  • ➕ As a number, 48,631 = 11 × 4421. Its digits add up to 22, a total 2,607 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1011110111110111
  • 🏠 Its numerical neighbours: 48630 (Houghton Lake Heights, MI, 59 mi away) and 48632 (Lake, MI, 52 mi away).
  • 🔄 Backwards, 48631 becomes 13684 — and that is a real ZIP code: Russell, NY, 448 miles away.
  • 👥 55 other ZIP codes are made of exactly the same digits (13468, 13486, 13648, 13684, 13846, 13864, …). The farthest-flung twin is 86413 in Golden Valley, AZ, 1,707 miles away.
  • 🧭 Farther north than 86% of all ZIP codes, and farther east than 60%.
  • 🎯796 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 48631 and you would come out at 43.69°S, 96.00°E — 1,280 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 27m of daylight. Shortest: 8h 55m.
  • 📏 At 32.9 square miles of land, 48631 is bigger than 48% of ZIP codes — room for about 25 Central Parks.
🌙 The sky over 48631 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population3,681This ZIP3,681
Households1,698This ZIP1,698
Housing units1,840This ZIP1,840
Median age50.7This ZIP50.7Michigan40.2US 38.9
Median household income$74,398This ZIP$74,398Michigan$72,875US $80,734
Median home value$172,200This ZIP$172,200Michigan$231,600US $332,700
Median gross rent$820This ZIP$820Michigan$1,129US $1,413
Bachelor's degree or higher16.5%This ZIP16.5%
Mean commute20.1 minThis ZIP20.1 min
Population density111.7 / sq miThis ZIP111.7 / sq mi

Business and tax activity

Business establishments84This ZIP84
Employees785This ZIP785
Annual payroll$38,968,000This ZIP$38,968,000
Tax returns filed2,290This ZIP2,290
Total adjusted gross income$163,296,000This ZIP$163,296,000

Land area

Land area32.95 sq miThis ZIP32.95 sq mi
Water area1.00 sq miThis ZIP1.00 sq mi

ZIP codes near 48631

ZIPCityDistance
48707 Bay City, MI 4.6 mi
48634 Linwood, MI 5.3 mi
48706 Bay City, MI 6.2 mi
48611 Auburn, MI 6.3 mi
48710 University Center, MI 9.1 mi
48650 Pinconning, MI 11.1 mi
48674 Midland, MI 11.3 mi
48732 Essexville, MI 11.6 mi
48708 Bay City, MI 11.7 mi
48642 Midland, MI 12.0 mi

Find every ZIP code within 10 miles of 48631 →

Questions about this ZIP code

Where is ZIP code 48631?

48631 is in Kawkawlin, Michigan, in Bay County, part of the Bay City, MI metropolitan area. Its published point location is 43.6886, -83.9959.

What county is 48631 in?

48631 lies in Bay County.

What area code is 48631?

Kawkawlin uses area code 989, from NANPA's telephone records.

What time zone is 48631 in?

48631 uses America/Detroit.

How many people live in 48631?

About 3,681 people live in ZIP code 48631, in 1,698 households, at 111.7 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 48631?

$74,398 a year, against $72,875 across Michigan.

What ZIP codes are near 48631?

The closest are 48707 (4.6 mi), 48634 (5.3 mi), 48706 (6.2 mi), 48611 (6.3 mi) and 48710 (9.1 mi).

Is 48631 a PO Box ZIP code?

48631 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “48631 ZIP Code — Kawkawlin, Michigan (Bay County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/48631

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/48631.json

Underlying data is public domain or openly licensed — sources, vintages and licences.