The parish of St. William the Abbot is located at 2000 Jackson Avenue, Seaford, NY 11783, one block south of Sunrise Highway (NY 27) and the Seaford railroad station. The parish telephone number is 516-785-1266, and its website is linked here. The parish was established in 1928. Twice, the church has been enlarged.
In December 2013, the parish purchased a new outdoor manger scene and placed a memorial list in the church lobby. Any photo may be enlarged by clicking on it.
Across Jackson Avenue is the parish elementary school at 2001 Jackson Avenue. The school telephone number is 516-785-6784, and its website is linked here. At first, Dominican Sisters from Amityville provided religious education. Later, when the school was opened Ursuline Sisters from Blue Point staffed the school for several decades. Of the parish elementary schools on Long Island, St. William's is the third or fourth highest in enrollment. In June, 2016, fifty-eight students graduated from eighth grade. In this era, that is a healthy number.