Regarding Sedgwick County and surrounds currently residing in Ogallala: The city of Wichita strongly influences the surrounding area. I'd argue that Butler county at least would be in the same state as Sedgwick, and possibly Cowley. Cowley is also strongly influenced by Tulsa, though, which is in Osage. I think the tipping point for where Cowley would fall is the location of next-door Sumner County. There is a strong link between Arkansas City and Winfield in Cowley with Wellington in Sumner.

Kansas City/St Joseph is likewise messy, being divided into three states. I know a lot of the towns on the Kansas side, as far west as Lawrence, are far more affected by KC's powerful economy than they are Topeka's political influence.