The population of Co Mayo is only one-third of what it was in 1841.
The Western Development Commission has compiled information from the 2016 Census of Population, which shows the population of Co Mayo in the last census was 130,507 - which is only 34% of what it was in 1841, but the county's population has increased by 5% over the past decade.
Castlebar, the county town, has a population of just over 12,000, while over 71% of people in Mayo live in rural areas.
The report shows almost 18% of people in Mayo are over the age of 65, and 20% are under the age of 15.
Females slightly outnumber males in Co Mayo at 50.2%.
56% of people in Mayo claim they have very good health, and 57% are in the workforce.
23 minutes is the average time to travel to work.
14% of works in Mayo are involved in industry, and 8.5% are working in agriculture.
35% of Mayo adults have a third-level qualification.