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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 — CITY/IL/OTTAWA

Ottawa ZIP code, Illinois

The ZIP code for Ottawa, IL is 61350, and its area code is 815.

USPS city name
1 ZIP code
Population
18,447
Area code
815

Ottawa in numbers

About 18,447 people live in Ottawa, in 7,553 households. The median household income is $71,413 a year, 14% below the Illinois median of $83,390 (US: $80,734). The median owner-occupied home is valued at $154,000 (42% below the Illinois median), and median gross rent is $920 a month. The median age is 39.8; 23.3% of adults 25 and over hold a bachelor's degree or higher (37.8% across Illinois); the average commute takes 23 minutes.

Population18,447Ottawa18,447
Households7,553Ottawa7,553
Median age39.8Ottawa39.8Illinois39.0US 38.9
Median household income$71,413Ottawa$71,413Illinois$83,390US $80,734
Median home value$154,000Ottawa$154,000Illinois$263,300US $332,700
Median gross rent$920Ottawa$920Illinois$1,274US $1,413
Bachelor's degree or higher23.3%Ottawa23.3%Illinois37.8%US 35.7%
Mean commute22.7 minOttawa22.7 minIllinois27.8 minUS 26.4 min
Population density1,238 / sq miOttawa1,238 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place Ottawa city. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as Ottawa

ZIP codes with the USPS city name Ottawa
ZIP City Type Population Median income Median home
61350 Ottawa , IL Standard 23,713 $77,921 $164,500

Map of Ottawa ZIP codes

61350

The ZIP codes of Ottawa, IL, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Ottawa

The nearest larger towns are Yorkville (23,617 people, 29 mi), Oswego (36,375 people, 34 mi) and Montgomery (21,515 people, 35 mi).

Towns near Ottawa
TownPopulationDistance
Marseilles 4,279 8.9 mi
Oglesby 3,570 13.5 mi
Sheridan 2,519 14.2 mi
LaSalle 9,498 14.3 mi
Streator 12,330 15.8 mi
Peru 9,775 16.4 mi
Spring Valley 5,476 18.8 mi
Mendota 6,994 20.0 mi
Lake Holiday 5,641 20.1 mi
Morris 14,898 20.8 mi
Sandwich 7,219 23.0 mi
Plano 12,203 27.0 mi
Dwight 3,872 27.3 mi
Coal City 5,317 28.7 mi

More nearby: every ZIP code in LaSalle County · Illinois ZIP codes

Cite this page

zipcodes.pro. “Ottawa, IL ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/il/ottawa

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