Cavalier County, ND neighbors Pembina near Langdon metropolitan centre granting an estimated 2020 census population standing of 4,129 making it the 11th most populous county situated in North Dakota overall. Its county seat is Langdon with other cities include Nekoma & Mountain- Langdon itself equates out to Cavalier’s biggesttown aside from acknowledged country seat. This area had been formed from Towner and Walsh Counties back in 1889 when local residents petitioned for new administrative boundaries - posthumously named after Beverly Randolph Cavalier Virginia political figure representing region prior era Abraham Lincoln .