Onslow is a typical "Solid South" county in its voting patterns. Except for the 1928 election when anti-Catholic voting allowed Herbert Hoover to carry the county in 1928, it was solidly Democratic until 1968, during the FDR years by margins of as much as 13 to one in 1936. However, the 1960s onwards had Onslow turn to George Wallace in 1968 and then overwhelmingly to Richard Nixon over George McGovern in 1972. Since then, Onslow has become a strongly Republican county; the last Democrat to carry it was Jimmy Carter in 1976 and Carter in 1980 remains the last of his party to top 40%.