Rainham belongs of the Medway Towns city its population usually included under Gillingham in the unitary authority of Medway, in South East England, as well as part of the ritualistic county of Kent. Historically, Rainham was a separate town until, in 1928, it was added to the Local Borough of Gillingham, which was originally created in 1903 and was grouped into the latter's built-up area in analysis of the 2011 census by the Office for National Statistics. It entered into the Medway authority when Gillingham was integrated with the various other communities to develop Medway Unitary Authority in 1998. It has its very own leisure as well as retail hub and unlike Gillingham has a typical location generally to the south and also which since the late 20th century is mainly domestic housing. Rainham was initially a linear settlement along the highway. The population in 1801 was 422; two centuries later on it is more than 6 thousand. Part of the factor for this huge growth can be attributed to the railway. When the railway came in 1858 it brought a virtually prompt increase in the dimension of the town; when the Chatham Main Line was electrified in 1959, just like all the places served by it, town growth began again. One of the outcomes was the structure of Parkwood estate.