O'Neill, NE, is in area code +1 402 and overlay code +1 531, the same as Omaha and Lincoln.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Nebraska has three area codes. The western part of the state is 308, including North Platte and Grand Island. The eastern part is 402 and 531 in an overlay, including Omaha and Lincoln.
308 for western Nebraska (North Platte, Grand Island) 402 & 531 for eastern Nebraska (Omaha, Lincoln)
Area code 308 is western Nebraska. It covers dozens of ZIP Codes.
Nebraska itself is a state. The cities and areas in it have the zip codes. For all the zip codes in Nebraska, look at the attached article below.
The area of Nebraska National Forest is 574.654 square kilometers.
Nebraska is 77,354 sq. miles in area.
Nebraska, USA -76,879 square miles (land area)77,421 sq miles (total area)
Lincoln is the capital city in Nebraska. Lincoln is located in the southeaster area of Nebraska.
Lincoln, the capital city in Nebraska, is located in the southeastern area of Nebraska.
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The Nebraska panhandle is the western area of the state. It is a rectangular area that borders the states of South Dakota, Wyoming and Colorado.
If you look at maps, you will not find area codes. Area codes can be found on area code locator websites. Another place to find area codes is in the telephone directory.