How do I find a ZIP code by city or state?

You can find ZIP codes by city or state using our search tool. Just enter the city or state name, and you'll see all related ZIP codes instantly.

What is a ZIP+4 code?

A ZIP+4 code adds four digits to the basic five-digit ZIP code. It helps the USPS deliver mail more precisely to specific addresses or buildings.

Are ZIP codes the same as postal codes?

ZIP codes are the U.S. version of postal codes, used by the USPS to identify delivery areas. Other countries use postal codes with different formats.

Complete ZIP Codes For Saint Clair, Illinois

Browse Saint Clair ZIP Codes

ZIP Codes in Saint Clair County help organize mail delivery and define local service areas. Each ZIP Code corresponds to a specific community or post office, ensuring residents, businesses, and visitors can find accurate address information quickly. By browsing the complete list of Saint Clair ZIP Codes, you can easily identify the correct code for mailing, business, or geographic purposes.

O Fallon

Post Office	O Fallon
Division	Saint Clair
Pincode	62269

Belleville

Post Office	Belleville
Division	Saint Clair
Pincode	62221

Belleville

Post Office	Belleville
Division	Saint Clair
Pincode	62226

Belleville

Post Office	Belleville
Division	Saint Clair
Pincode	62220

Belleville

Post Office	Belleville
Division	Saint Clair
Pincode	62223

Fairview Heights

Post Office	Fairview Heights
Division	Saint Clair
Pincode	62208

Total Post Offices (30) Page 1 of 5
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Cities in Saint Clair

20 cities in Saint Clair County | List of ZIP Codes in Illinois

ZIP codes in Saint Clair County, Illinois not only facilitate mail delivery but also provide important demographic and geographic insights. Each ZIP code corresponds to specific areas within the county, helping businesses, residents, and researchers understand population distribution, city locations, and service coverage across Saint Clair County.

Businesses and service providers rely on accurate ZIP code information in Saint Clair County to plan deliveries, target customers, and ensure timely services. By referencing the full list of ZIP codes, companies can optimize logistics and outreach, while residents can easily identify the correct postal codes for their addresses within Illinois.

Knowing the correct ZIP codes in Saint Clair County ensures fast and accurate mail delivery from the United States Postal Service (USPS). It also helps travelers, online shoppers, and local residents navigate efficiently across towns and communities in Saint Clair County, making ZIP codes an essential part of daily life and business operations.