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Zip Code 27577 — Smithfield, NC

27577 is a ZIP Code associated with Smithfield, NC, located within Johnston. The postal region supports an estimated population of 28,354 residents across Data Pending housing units, with a population density of 105.6 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (35.491660, -78.344600)

Data Metric	Local Statistic
Postal / Zip Code	27577
Primary City	Smithfield
State / Province	NC
County	Johnston
Total Population	28,354
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	105.6 people/sq mi
Timezone	America/New_York

How 27577 Compares

Metric	ZIP 27577	Johnston County	NC State Average
Population	28,354	189,124	10,730,463
Median Income	Data Pending	N/A	N/A
Population Density	105.6 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 27568	Pine Level	5.9 mi	1,542	N/A
Zip 27593	Wilsons Mills	6.6 mi	N/A	N/A
Zip 27524	Four Oaks	7.0 mi	13,999	N/A
Zip 27576	Selma	8.0 mi	21,624	N/A
Zip 27555	Micro	9.3 mi	573	N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →