Rainham belongs of the Medway Towns urban sprawl its population typically included under Gillingham in the unitary authority of Medway, in South East England, and also part of the ritualistic county of Kent. Historically, Rainham was a separate town until, in 1928, it was contributed to the Metropolitan Borough of Gillingham, which was originally developed in 1903 and also was grouped right into the latter's built-up area in analysis of the 2011 census by the Office for National Statistics. It became part of the Medway authority when Gillingham was integrated with the other towns to create Medway Unitary Authority in 1998. It has its very own recreation as well as retail center and unlike Gillingham has a traditional area generally to the south and which because the late 20th century is largely domestic housing. Rainham was initially a linear settlement along the highway. The population in 1801 was 422; two centuries later on it is well over six thousand. Part of the reason for this substantial growth can be credited to the train. When the train came in 1858 it brought a practically instant rise in the size of the village; when the Chatham Main Line was electrified in 1959, as with all the areas offered by it, community development began again. One of the outcomes was the structure of Parkwood estate.