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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/85128

85128

ZIP 85128 is Coolidge, Arizona, in Pinal County; area code 520; Mountain Standard Time all year.

Type
Standard
Time zone
America/Phoenix
County
Pinal
Population
19,487
Coordinates
32.9628, -111.5098
☼ Live from 85128 — Coolidge, AZ

Weather right now

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Local time: —

Where 85128 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 85128
  • 🔢 Type 85128 into a pocket calculator and turn it upside down: BZISB — not quite a word, sorry.
  • ➕ As a number, 85,128 = 2 × 2 × 2 × 3 × 3547. Its digits add up to 24, a total 2,425 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10100110010001000
  • 🏠 Its numerical neighbours: 85127 (Chandler Heights, AZ, 20 mi away) and 85130 (Casa Grande, AZ, 15 mi away).
  • 🔄 Backwards, 85128 becomes 82158, which is not a ZIP code at all.
  • 👥 15 other ZIP codes are made of exactly the same digits (12588, 12858, 12885, 15828, 18825, 25818, …). The farthest-flung twin is 12858 in Paradox, NY, 2,159 miles away.
  • 🧭 Farther south than 84% of all ZIP codes, and farther west than 86%.
  • 🎯860 miles southwest of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 85128 and you would come out at 32.96°S, 68.49°E — 1,114 miles from Port Louis, Mauritius, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 20m of daylight. Shortest: 9h 58m.
  • 📏 At 166.7 square miles of land, 85128 is bigger than 88% of ZIP codes — room for about 127 Central Parks.
🌙 The sky over 85128 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population19,487This ZIP19,487
Households6,181This ZIP6,181
Housing units6,698This ZIP6,698
Median age32.7This ZIP32.7Arizona39.0US 38.9
Median household income$65,477This ZIP$65,477Arizona$79,964US $80,734
Median home value$249,000This ZIP$249,000Arizona$394,500US $332,700
Median gross rent$1,304This ZIP$1,304Arizona$1,543US $1,413
Bachelor's degree or higher13.4%This ZIP13.4%
Mean commute24.9 minThis ZIP24.9 min
Population density116.9 / sq miThis ZIP116.9 / sq mi

Business and tax activity

Business establishments195This ZIP195
Employees2,579This ZIP2,579
Annual payroll$102,861,000This ZIP$102,861,000
Tax returns filed7,820This ZIP7,820
Total adjusted gross income$414,055,000This ZIP$414,055,000

Land area

Land area166.65 sq miThis ZIP166.65 sq mi
Water area1.74 sq miThis ZIP1.74 sq mi

Other place names in 85128

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

ZIP codes near 85128

ZIPCityDistance
85191 Valley Farms, AZ 4.0 mi
85194 Casa Grande, AZ 8.1 mi
85143 San Tan Valley, AZ 13.4 mi
85122 Casa Grande, AZ 14.2 mi
85130 Casa Grande, AZ 15.3 mi
85147 Sacaton, AZ 15.6 mi
85144 San Tan Valley, AZ 15.8 mi
85132 Florence, AZ 17.3 mi
85142 Queen Creek, AZ 18.3 mi
85140 San Tan Valley, AZ 19.7 mi

Find every ZIP code within 10 miles of 85128 →

Questions about this ZIP code

Where is ZIP code 85128?

85128 is in Coolidge, Arizona, in Pinal County, part of the Phoenix-Mesa-Chandler, AZ metropolitan area. Its published point location is 32.9628, -111.5098.

What county is 85128 in?

85128 lies in Pinal County.

What area code is 85128?

Coolidge uses area code 520, from NANPA's telephone records.

What time zone is 85128 in?

85128 uses America/Phoenix.

How many people live in 85128?

About 19,487 people live in ZIP code 85128, in 6,181 households, at 116.9 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 85128?

$65,477 a year, against $79,964 across Arizona.

What ZIP codes are near 85128?

The closest are 85191 (4 mi), 85194 (8.1 mi), 85143 (13.4 mi), 85122 (14.2 mi) and 85130 (15.3 mi).

Is 85128 a PO Box ZIP code?

85128 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “85128 ZIP Code — Coolidge, Arizona (Pinal County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/85128

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