Coal was mined near Valentine by the Hartley Company in the mid 1800s, before it became a suburb in the 1950s, facing North, looking over the shallow waters of Croudace Bay. The public school opened in 1958. It is now a large residential district, a development commenced in the late 1980s. Valentine is home to number of convenience and specialty shops, including a butcher, post office, GP office, petrol station, newsagent and a bowling club.

The first house was built by Mr Thomas Croudace in the 1860s adjacent to the park on Valentine Crescent, and some of the trees from that original house still stand within the eastern portion of the park. A dairy was located further up the creek to the south, and at one stage the creek was dammed for a swimming area.

Valentine was named after Mr Henry Valentine Joseph Geary, a property speculator and company director who grew up in Melbourne, Victoria, and settled in NSW after 1909, speculating in mining. He owned land in Valentine, but lived on the Hawkesbury River, and died in 1933. Henry Halloran, a surveyor who surveyed the area in 1916, named the area after him. He was also responsible for surveying many of the suburbs in Sydney, including Seaforth.

The first cottage was built in the late 1920s but there being no usable road, no water, electricity or sewerage development, was slow. A ferry provided holiday makers with access from Speers Point and a small shop was open on weekends. Because the only access was by water, most of the houses were built on or near the foreshore adjacent to Dilkera Avenue (an aboriginal word meaning "by the shore". The road from Warner's Bay to Belmont came through in the late 1930s, and was tarred in 1956. A permanent shop was opened in 1945 and the first telephone service in 1946 with 20 subscribers. Town water and electricity came through in 1948. Children attended school in Belmont but by 1957 there were enough children to run a small school from the Progress Hall (built in 1954) whilst a new school opened in 1958.

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