Cromer is a suburb 20 kilometres north-east of the Sydney central business district. Cromer is bordered to the north by Narrabeen Lakes.
Cromer is named after the seaside town of Cromer, in Norfolk, England. The area had been known as Dee Why West but it was changed after Dee Why Golf Links was taken over by the Cromer Country Club in 1940. The club applied to have the area's name changed to Cromer and permission was granted to create the new suburb.
Cromer Post Office opened on 1 September 1959 and closed in 1992.
Cromer Public School (K-6) and Northern Beaches Secondary College Cromer Campus (7-12) are the two public schools in the suburb.
The education status of people living in Cromer is Infants/Primary (7%), Secondary Education (6%), Technical or Further Education (4%), University or other Tertiary Institution (3%) and Not Attending (Working) (78%).
Cromer Heights is an unbounded "urban place" located on the high ground of south-west Cromer identified by the Geographical Names Board of New South Wales.
Cromer is home to a number of parks and reserves, including Truman Reserve, Wambiri Place Reserve, St Matthews Farm Reserve, Dee Why West Recreation Reserve, James Morgan Reserve and Inman Park. The parks are home to a variety of sports throughout the year, such as soccer, rugby union, touch football, baseball, softball and cricket.
Warringah archers, located next to the Cromer High School, is a long-standing archery club that hosts tournaments for archers from all over Sydney. Cromer Cricket Club fields teams in the MWJCA and MWCA competitions.
Dee Why West Recreation Reserve is located between Cromer Heights and Wakehurst Parkway. The reserve is a popular destination of bush walking, trail bike riding and mountain bike riding.
In recent years there have been several attempts by private property developers to turn the reserve into a housing estate. Warringah Council has denied any further development of the reserve citing population decline and environmental factors.
In the 2016 Census, there were 7,592 people in Cromer. 71.8% of people were born in Australia. The most common countries of birth were England 6.7%, New Zealand 1.9% and Italy 1.4%. 82.9% of people spoke only English at home. Other languages spoken at home included Italian at 2.1%. The most common responses for religion were No Religion 29.4%, Catholic 27.5% and Anglican 19.7%. The occupational breakdown of Cromer residents was Professionals 23.4%, Managers 15.7%, Clerical and Administrative Workers 15.0%, Technicians and Trades Workers 14.5%, and Community and Personal Service Workers 10.0%. The median age is 42 and the median weekly household income is $1,998.