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The 51040 ZIP Code is centered1 in Monona County at latitude 42.029 and longitude -96.098. It is a standard type ZIP Code. Monona County is in the Central Time Zone (UTC -6 hours) and observes daylight savings time.
ZIP Code Tabulation Area (ZCTA) 51040 has a land area of 152.23 sq. miles and a water area of 2.14 sq. miles for Census 2000. Demographic Profile
Onawa, IA 51040 Map (Interactive ZIP Code Map of 51040 ZIP Code)
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Onawa, IA
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Arizona, NE (14.9 miles S)ZIP Codes - Key Concepts
- ZIP Codes are categories for grouping mailing addresses and are not exact geographic regions.
- The centroid of a ZIP Code may be in one County and the associated city/town in another.
- In rural areas, a single ZIP Code may be used for cities and towns in several different Counties.
- ZIP Code "areas" can overlap, be subsets of each other, or be artificial constructs with no geographic area.
- ZIP Codes are only loosely tied to cities.
1 Keeping the above key concepts in mind, what we informally refer to as the "center" of a ZIP Code is most often actually the centroid of a polygon.