Average GPS coordinates for Seward Postcode location: 42.237, -89.358. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Seward on map:

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Listing cities & postcodes (1):
>> Illinois, 61077 Seward, Winnebago, GPS coordinates: 42.2368,-89.358