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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/45503

45503

ZIP 45503 is in Springfield, Ohio, in Clark County; area codes 937 and 326; Eastern time. Springfield has 6 ZIP codes; the others are 45501, 45502, 45504, 45505 and 45506.

Type
Standard
Time zone
America/New_York
County
Clark
Metro area
Springfield, OH
Population
32,638
Coordinates
39.9651, -83.7675
☼ Live from 45503 — Springfield, OH

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Local time: —

Where 45503 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 45503
  • 🔢 Type 45503 into a pocket calculator and turn it upside down: EOSSh — not quite a word, sorry.
  • ➕ 45503 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 17, a total 2,133 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1011000110111111
  • 🏠 Its numerical neighbours: 45502 (Springfield, OH, 7 mi away) and 45504 (Springfield, OH, 5 mi away).
  • 🔄 Backwards, 45503 becomes 30554 — and that is a real ZIP code: Lula, GA, 385 miles away.
  • 👥 36 other ZIP codes are made of exactly the same digits (03455, 04355, 04535, 04553, 05345, 05354, …). The farthest-flung twin is 04553 in Newcastle, ME, 781 miles away.
  • 🧭 Farther north than 56% of all ZIP codes, and farther east than 61%.
  • 🎯784 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 45503 and you would come out at 39.97°S, 96.23°E — 1,226 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 01m of daylight. Shortest: 9h 20m.
  • 📏 At 17.5 square miles of land, 45503 is bigger than 35% of ZIP codes — room for about 13 Central Parks.
🌙 The sky over 45503 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population32,638This ZIP32,638
Households14,202This ZIP14,202
Housing units15,403This ZIP15,403
Median age41.1This ZIP41.1Ohio39.7US 38.9
Median household income$59,595This ZIP$59,595Ohio$71,389US $80,734
Median home value$168,200This ZIP$168,200Ohio$214,800US $332,700
Median gross rent$892This ZIP$892Ohio$1,034US $1,413
Bachelor's degree or higher19.8%This ZIP19.8%
Mean commute23.3 minThis ZIP23.3 min
Population density1,868.8 / sq miThis ZIP1,868.8 / sq mi

Business and tax activity

Business establishments450This ZIP450
Employees7,084This ZIP7,084
Annual payroll$264,445,000This ZIP$264,445,000
Tax returns filed15,150This ZIP15,150
Total adjusted gross income$849,431,000This ZIP$849,431,000

Land area

Land area17.47 sq miThis ZIP17.47 sq mi
Water area3.20 sq miThis ZIP3.20 sq mi

Other place names in 45503

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

ZIP codes near 45503

ZIPCityDistance
45501 Springfield, OH 3.4 mi
45505 Springfield, OH 4.4 mi
45372 Tremont City, OH 5.0 mi
45504 Springfield, OH 5.3 mi
45506 Springfield, OH 5.4 mi
45502 Springfield, OH 7.4 mi
43010 Catawba, OH 8.1 mi
45369 South Vienna, OH 9.2 mi
45349 North Hampton, OH 9.3 mi
45319 Donnelsville, OH 9.9 mi

Find every ZIP code within 10 miles of 45503 →

Questions about this ZIP code

Where is ZIP code 45503?

45503 is in Springfield, Ohio, in Clark County, part of the Springfield, OH metropolitan area. Its published point location is 39.9651, -83.7675.

What county is 45503 in?

45503 lies in Clark County.

What area code is 45503?

Springfield uses area codes 937 and 326, from NANPA's telephone records.

What time zone is 45503 in?

45503 uses America/New_York.

How many people live in 45503?

About 32,638 people live in ZIP code 45503, in 14,202 households, at 1,868.8 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 45503?

$59,595 a year, against $71,389 across Ohio.

What ZIP codes are near 45503?

The closest are 45501 (3.4 mi), 45505 (4.4 mi), 45372 (5 mi), 45504 (5.3 mi) and 45506 (5.4 mi).

Is 45503 a PO Box ZIP code?

45503 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “45503 ZIP Code — Springfield, Ohio (Clark County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/45503

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