ZIP Code 4978
- Zip Code: 4978
- Official USPS city name: Smithfield
- Official USPS State Code: ME
- Official State Name: Maine
- ZCTA: TRUE
- Population: 766.0
- Density: 19.6
- Primary Official County Code: 23025
- Primary Official County Name: Somerset
- Official County Name: Somerset
- Official County Code: 23025
- Imprecise: FALSE
- Military: FALSE
- Timezone: America/New_York (21:03 PM Thursday, October 31 2024-10-31 (GMT -0400))
- Geo Point: 44.62916, -69.8013
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