About Osea Island
Osea Island is located in Essex, England, within the CM9 postcode area. This private island is situated in the Blackwater Estuary and is accessible only by a causeway, which is submerged at high tide. The island spans approximately 200 acres and features a variety of landscapes, including marshland and woodland. It is primarily known for its residential properties and offers a unique setting for those seeking a retreat from the mainland. The island has a small community and is often used for private events and gatherings. Facilities include a few accommodation options, making it suitable for short stays. Osea Island is also home to various wildlife, providing opportunities for nature enthusiasts to observe local fauna. The surrounding waters are popular for boating and fishing, adding to the island's appeal for outdoor activities.
School Ratings in Osea Island
There are 13 schools in and around Osea Island. A further 9 schools hold a Good rating.
House Prices in Osea Island
The average property price is £393K, with detached homes making up the majority of the housing stock at around £510K.
Crime and Anti-Social Behaviour in Osea Island
Recorded crime levels are lower than the national average. Criminal damage & arson is prevalent across Osea Island, with 9 recorded incidents in January 2026.
Deprivation and Employment in Osea Island
Osea Island sits around the middle of the national deprivation scale, according to the 2025 Index of Multiple Deprivation. Employment levels are broadly typical for the area, sitting close to the national average. Household incomes are broadly in line with the national average.
Broadband and Mobile Internet in Osea Island
Broadband speeds in Osea Island are generally strong, with superfast and ultrafast options widely available. Mobile coverage across 4G and 5G networks is reliable throughout most of the area. For the latest speed predictions, visit Ofcom's broadband checker.
Property Prices 4,978 sales
Schools & Education 12 nearby View all schools
Deprivation and Employment in Osea Island IMD 2025
Osea Island sits around the national average for deprivation according to the 2025 Index of Multiple Deprivation. Employment and income levels are broadly typical, reflecting a mixed local economy. The area offers a balance of residential and commercial activity common to most parts of England.
Crime in Osea Island 114 crimes · January 2026
Osea Island records relatively low levels of reported crime compared to national averages. Violence & sexual offences is the most commonly logged offence type, though overall numbers remain modest. The area is generally considered a safe and settled town with a strong sense of community.
Crime figures depend on reporting by individual police forces and may not reflect the full picture in all areas.