Colombo

• District Population: 2,310,136
• Population Density 3417 Persons / Km²
• Land Area 699 Km²
• Birth Rate 15.7 / 1000 population
• Death Rate 6.7 / 1000 population

* Source: Census of Population and Housing, 2012 (Provisional)

• Number of MOH Areas: 18
• Estimated Mid-Year Total Population: 1,867,769
• Estimated Mid-Year 30+ Population: 1,072,151

* Source: Medical Statistics Unit,Ministry of Health, 2021

Gampaha

• District Population: 2,294,806
• Population Density 1711 Persons / Km²
• Land Area 1,387 Km²
• Birth Rate 14.4 / 1000 population
• Death Rate 5.6 / 1000 population

* Source: Census of Population and Housing, 2012 (Provisional)

• Number of MOH Areas: 16
• Estimated Mid-Year Total Population: 2,428,443
• Estimated Mid-Year 30+ Population: 1,326,540

*Includes BOI-Katunayake MOH Area which does not have usual residents
* Source: Medical Statistics Unit,Ministry of Health, 2021

Kalutara

• District Population: 1,217,566
• Population Density 773 Persons / Km²
• Land Area 1,598 Km²
• Birth Rate 15.4 / 1000 population
• Death Rate 6.3 / 1000 population

* Source: Census of Population and Housing, 2012 (Provisional)

• Number of MOH Areas: 13
• Estimated Mid-Year Total Population: 1,289,543
• Estimated Mid-Year 30+ Population: 611,925

* Source: Medical Statistics Unit,Ministry of Health, 2021