Two families in Evanston, Wyoming in 1900 (1900 Census) were headed by a John Wagstaff. Both men were coal miners. One was from Derbeyshire, England. The other, Croydon John, was from Lancashire.

The latter bought a house in Croydon and married Sarah  Ann Molyneux (first husband was Willliam Shaw) in 1909. Morgan County probate and property records need to be checked.

Please let me know if you have further information.