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Where 45820 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.
- 🔢 Type 45820 into a pocket calculator and turn it upside down: OZBSh — not quite a word, sorry.
- ➕ As a number, 45,820 = 2 × 2 × 5 × 29 × 79. Its digits add up to 19, a total 2,454 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1011001011111100 - 🏠 Its numerical neighbours: 45819 (Buckland, OH, 17 mi away) and 45821 (Cecil, OH, 37 mi away).
- 🔄 Backwards, 45820 becomes 02854, which is not a ZIP code at all.
- 👥 62 other ZIP codes are made of exactly the same digits (02458, 02584, 04258, 04285, 04852, 05482, …). The farthest-flung twin is 85042 in Phoenix, AZ, 1,617 miles away.
- 🧭 Farther north than 65% of all ZIP codes, and farther east than 60%.
- 🎯766 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 45820 and you would come out at 40.83°S, 95.92°E — 1,263 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 15h 06m of daylight. Shortest: 9h 14m.
- 📏 At 0.277 square miles of land, 45820 is bigger than 3% of ZIP codes — about 134 football fields.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 581This ZIP581 |
|---|---|
| Households | 214This ZIP214 |
| Housing units | 239This ZIP239 |
| Median age | 35.9This ZIP35.9Ohio39.7US 38.9 |
| Median household income | $83,125This ZIP$83,125Ohio$71,389US $80,734 |
| Median home value | $114,500This ZIP$114,500Ohio$214,800US $332,700 |
| Median gross rent | $1,023This ZIP$1,023Ohio$1,034US $1,413 |
| Bachelor's degree or higher | 20.4%This ZIP20.4% |
| Mean commute | 17.9 minThis ZIP17.9 min |
| Population density | 2,097.5 / sq miThis ZIP2,097.5 / sq mi |
Business and tax activity
| Business establishments | 4This ZIP4 |
|---|---|
| Employees | 46This ZIP46 |
| Annual payroll | $3,941,000This ZIP$3,941,000 |
Land area
| Land area | 0.28 sq miThis ZIP0.28 sq mi |
|---|---|
| Water area | 0.00 sq mi |
Other place names in 45820
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 45820
| ZIP | City | Distance |
|---|---|---|
45802 | Lima, OH | 4.4 mi |
45893 | Vaughnsville, OH | 4.7 mi |
45801 | Lima, OH | 4.8 mi |
45807 | Lima, OH | 4.9 mi |
45809 | Gomer, OH | 5.3 mi |
45830 | Columbus Grove, OH | 5.4 mi |
45808 | Beaverdam, OH | 5.8 mi |
45805 | Lima, OH | 8.2 mi |
45804 | Lima, OH | 8.5 mi |
45854 | Lafayette, OH | 8.5 mi |
Find every ZIP code within 10 miles of 45820 →
Questions about this ZIP code
Where is ZIP code 45820?
45820 is in Cairo, Ohio, in Allen County, part of the Lima, OH metropolitan area. Its published point location is 40.8308, -84.0845.
What county is 45820 in?
45820 lies in Allen County.
What area code is 45820?
Cairo uses area codes 419 and 567, from NANPA's telephone records.
What time zone is 45820 in?
45820 uses America/New_York.
How many people live in 45820?
About 581 people live in ZIP code 45820, in 214 households, at 2,097.5 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 45820?
$83,125 a year, against $71,389 across Ohio.
What ZIP codes are near 45820?
The closest are 45802 (4.4 mi), 45893 (4.7 mi), 45801 (4.8 mi), 45807 (4.9 mi) and 45809 (5.3 mi).
Is 45820 a PO Box ZIP code?
45820 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “45820 ZIP Code — Cairo, Ohio (Allen County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/45820
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/45820.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.