"Wexford, a county of Ireland, province of Leinster, bounded E by St George's channel, S by Waterford bay, SW by Kilkenny, W by Carlow, and N by Wicklow. 38 Irish m. long and 24 broad. Area 315,396 Irish plantation acres. Chief rivers, the Nore and Barrow. It has two boroughs, Wexford and New Ross, each sending a member to parliament, and the county sends 2 more. Pop. 169,304."
[From The New London Gazetteer (1826)]
The Irish Ancestors website (subscription) has the following types of records: State Registration of Births, Marriages & Deaths, Census returns, Land records, Church records, Genealogical Office records, Gravestone inscriptions, Directories, Newspapers, Wills, Deeds, and Occupations.
The Fianna website's pages for County Wexford provide important addresses and extensive information about online and other genealogy resources.
Roots Ireland (subscription) "offers access to a unique database of more than 20 million Irish records". Its Wexford coverage includes Baptismal/Birth Records, Marriage Records, Burial/Death Records and Griffith's Valuation (Free Access).