E. B. Raymond came to South Texas on horseback in 1870 where he herded cattle to Kansas. In 1874 he was hired by Richard King to open the new El Sauz division of the King Ranch. Raymond would serve as the manager of the El Sauz division for 37 years and was empowered to purchase land on King's behalf until 1882. In 1893, the El Sauz Post Office was established where Raymond served as the postmaster and telegraph operator. In 1898 he was elected Cameron County Commissioner, a position he held until 1910. In 1904, he joined with the King Ranch to deed the right of way to the St. Louis, Brownsville & Mexico Railway and donated a station site near his Las Majadas Ranch which was later named in his honor. In that same year, on the fourth of July, he created the Raymond Town & Improvement Company, was granted a post office, and began selling plots of land with Henrietta King. In 1907 he established the Raymondville State Bank where he served as president until his death. In addition, Raymond built a telephone exchange and cotton gin . After his death, Raymondville became the county seat of Willacy County in 1921 after Kenedy County split from Willacy.
Raymond was married to Juanita Rodrigurez, and was the father of two sons, Fred N. and Edward Charles. When Raymond died he left his 92,000 acre Las Majadas Ranch to his two sons and wife.