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U.S. ZIP Codes Database 2026

Name: Loudon County
Address: US

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Loudon County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Loudon County.

County	State	ZIP Code	City	Area Codes
Loudon County	TN	37742	Greenback	`423, 865`
Loudon County	TN	37771	Lenoir City	`865`
Loudon County	TN	37772	Lenoir City	`865`
Loudon County	TN	37774	Loudon	`423, 865`
Loudon County	TN	37846	Philadelphia	`423, 865`

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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.