Castle Point Astronomy Club (CPAC), originally founded in 1969 as the Rayleigh Astronomical Society (RayAS). Members meet weekly (Wed.) at St Michael and All Angels´ Church, St Michael´s Road, Daws Heath, Hadleigh, Benfleet, Essex.
Clacton and District Astronomical Association (ClaDAA), founded 1969. In 1974 the society built a club observatory that last 21 years before being vandalised. Members (20) meet monthly (3th Tues.) at Christ Church United Reform Church, 6 Carnarvon Road Clacton-on-sea (CO15 6PH).
East Essex Astronomy Club (EEAS), founded (2014). Members meet monthly (Sat.) at Village Hall, Arcadia Road, Burnham on Crouch (CM0 8EF).
Havering Astronomical Society (HavAS), founded 1994. Members (40-2018) meet monthly (3rd Wed.) at Thames Chase Forest Centre, Pike Ln, Upminster – formerly Cranham Community Centre, Marlborough Gardens, Cranham (RM14 3NS).
Loughton Astronomical Society (LoAS), founded 1968 from a telescope mirror making class at Loughton College. Members (70-2016) initially met at Loughton Hall (Debden Community Association) where the group established an observatory with a 16-inch reflecting telescope – now remounted as a Dobsonian telescope. They also provide junior astronomy outreach, Theydon Bois AstroKyds (TBAK). The society also hosts the Autumn Equinox star camp at Kelling Heath in Norfolk. Weekly meetings are now held at the Scout Hall, Theydon Bois (CM16 7EJ).
North Essex Astronomical Society (NEAS), originally founded as the Braintree Astronomical Society (BraiAS) – name change 2000. Members meet at The Henry Dixon Hall, Henry Dixon Road, Rivenhall End (CM8 3HR). Observing sessions are held at their Munday-Sayer Observatory, located near Wakes Colne, that houses a 11-inch Celestron SCT reflecting telescope.
South East Essex Astronomical Society (SEEAS), active 1979 and later, but now appears dormant (2016).
South Essex Astronomy Group (SEAG), founded 2017. Members meet monthly (2nd Wed.) at Hawkwell Village Hall, Main Road, Hawkwell. Members meet monthly at the Horndon Methodist Hall, High Street, Horndon-on-the-Hill (SS17 8LN)
Thurrock Astronomical Society (ThAS), founded 1997 by a keen group of people who met at evening classes whilst studying for their GCSE in Astronomy.