# St Mary's Island

Central Medway. About 4,596 people (mid-2024 estimate) in 1.4 square kilometres.

St Mary's Island had 4,078 usual residents at the census (ONS Census 2021).

Ward. Code E05014466. In: [South East](https://openindex.co.uk/south-east) › [Medway](https://openindex.co.uk/medway)

## Key figures

- **Population: 4,078** (2021). St Mary's Island had 4,078 usual residents at the census (ONS Census 2021). 1,949th least populated of 8,397. Source: Census 2021, England and Wales and Scotland's Census 2022 and Census 2021, Northern Ireland, 2021. Published 21 July 2026. https://openindex.co.uk/medway/ward/st-marys-island#f-population
- **People in radon Affected Area squares: 0%** (2022). About 0% of people in St Mary's Island live in a 1 km square that the radon atlas marks as a radon Affected Area. UK 44%. Source: Worked out by Open Index from the UKHSA and BGS radon atlas and census output areas. Published 1 December 2022. https://openindex.co.uk/medway/ward/st-marys-island#f-radon-affected-share
- **Gigabit broadband coverage: 99.8%** (January 2026). In St Mary's Island, 99.8% of homes and businesses could get gigabit-capable broadband in January 2026 (Ofcom). UK 87.8%. Source: Connected Nations (Ofcom), January 2026. Published 13 May 2026. https://openindex.co.uk/medway/ward/st-marys-island#f-gigabit-coverage
- **Claimant rate: 1.7%** (August 2026). In St Mary's Island, 1.7% of residents aged 16 to 64 were claiming out-of-work benefits in August 2026 (ONS via Nomis). UK 3.9%. Source: Claimant count (Nomis), August 2026. Published 15 September 2026. https://openindex.co.uk/medway/ward/st-marys-island#f-claimant-rate

## On the map

- [Radon Affected Area by ward](https://openindex.co.uk/map/radon-affected-areas#place=E05014466) (Worked out by Open Index · 2022): About 0% of people in St Mary's Island live in a 1 km square that the radon atlas marks as a radon Affected Area.
- [Average house price by council](https://openindex.co.uk/map/house-prices#place=E05014466) (UK House Price Index · August 2026): Published for whole councils, so the map colours all of Medway. The outline is St Mary's Island.
- [Crime and ASB by ward](https://openindex.co.uk/map/recorded-crime#place=E05014466) (Police recorded crime and outcomes (data.police.uk) · August 2026): Police recorded 7 crimes and anti-social behaviour incidents in St Mary's Island in August 2026.
- [Population by ward](https://openindex.co.uk/map/population#place=E05014466) (Census 2021, England and Wales): St Mary's Island had 4,078 usual residents at the census.

## How St Mary's Island compares

Each ward against every other ward the measure covers.

| Measure | St Mary's Island | Rank | Compared with |
| --- | --- | --- | --- |
| Population | 4,078 | least populated | 24 wards, Medway · 2021 |
| People in radon Affected Area squares | 0% | joint fewest people in radon Affected Areas | 24 wards, Medway · 2022 |
| Gigabit broadband coverage | 99.8% | joint highest | 24 wards, Medway · Jan 2026 |
| Claimant rate | 1.7% | 2nd lowest | 24 wards, Medway · Aug 2026 |

## Is St Mary's Island safe? What police records show

In the 12 months to August 2026, police recorded crimes and anti-social behaviour in St Mary's Island at a rate of 28.1 per 1,000 people.
That compares with 102.4 per 1,000 people across Medway.
Across England as a whole, the recorded crime rate was 96.3 per 1,000 people.
In August 2026 alone, 7 cases of crime and anti-social behaviour were recorded in St Mary's Island.
In the 12 months to August 2026, the most common types were violence and sexual offences (53), other crime (22) and anti-social behaviour (19).
Worked out by Open Index from police.uk crime records and ONS and NISRA population estimates.
Rates are per resident, so places that many people work in or visit, such as Westminster, the City of London and other city centres, have far higher rates than their residents alone would suggest.

## Figures for the whole of Medway

These figures are published for the whole of Medway, not for each ward, so they describe all of Medway and not St Mary's Island alone. [See Medway](https://openindex.co.uk/medway)

- **Average house price: £297,757** (August 2026). Medway’s average house price was £297,757 in August 2026 (HM Land Registry). Up 0.5% in a year. Source: UK House Price Index, August 2026. Published 21 October 2026.
- **Median full-time pay: £39,622** (2025). Full-time workers living in Medway earned a median of £39,622 in 2025 (ONS earnings survey). 150th highest paid of 348. Source: Annual Survey of Hours and Earnings, 2025. Published 23 October 2025.
- **House price to pay: 7.5×** (2025). A home in Medway costs 7.5 times local full-time pay. Joint 163rd least affordable of 348. Source: Worked out by Open Index from the UK House Price Index and the ONS earnings survey. Published 21 October 2026.
- **Deprivation score: 24.4** (2025). Medway has a deprivation score of 24.4 in the English Indices of Deprivation 2025 (MHCLG). Joint 84th most deprived of 296. Source: English Indices of Deprivation 2025, 2025. Published 30 October 2025.

## St Mary's Island in brief

St Mary's Island had 4,078 usual residents at the census.
About 0% of people in St Mary's Island live in a 1 km square that the radon atlas marks as a radon Affected Area.
In St Mary's Island, 99.8% of homes and businesses could get gigabit-capable broadband in January 2026.
In St Mary's Island, 1.7% of residents aged 16 to 64 were claiming out-of-work benefits in August 2026.

## About

- Type: Ward
- Code: E05014466
- Constituency: [Rochester and Strood †](https://openindex.co.uk/constituency/rochester-and-strood)
- Council: [Medway](https://openindex.co.uk/medway)
- Region: [South East](https://openindex.co.uk/south-east)
- Nation: [England](https://openindex.co.uk/england)
- Area: 1.43 km²
- People, mid-2024: 4,596*
- Neighbourhoods: 2
- Output areas: 13

* People: worked out by Open Index from neighbourhood estimates, shared out by where people lived at the census (by area in Northern Ireland). This area's edges do not follow neighbourhood edges, so the figure is close but not exact.
† Best fit: the constituency this ward mostly lies in. Its edges do not follow it.

## Next door

[Chatham Central & Brompton](https://openindex.co.uk/medway/ward/chatham-central-and-brompton), [Gillingham North](https://openindex.co.uk/medway/ward/gillingham-north)

## Latest updates for St Mary's Island

- August 2026 house prices published: HM Land Registry and partners · Oct 2026.
- September 2026 rent published: ONS private rents · Oct 2026.
- Dental practices updated: NHS England · Oct 2026.
- Schools updated: Ofsted · Oct 2026.

The same figures as JSON: https://openindex.co.uk/v1/places/E05014466

## How to cite

Source: Open Index, openindex.co.uk. Link to this page, https://openindex.co.uk/medway/ward/st-marys-island, or to one figure with its anchor, https://openindex.co.uk/medway/ward/st-marys-island#f-population.

Open Index's own text and the figures it works out are licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source data keeps its publishers' licences, named with each figure. Give each figure's period and source with it.

Snapshot 2026.10.11. The HTML page: https://openindex.co.uk/medway/ward/st-marys-island