The census of April 2016 recorded 30,987 Irish Travellers in the population, an increase of 5.1% on 2011.
Almost 60% were under the age of 25, in marked contrast to the general population in which just over half that proportion (33%) were in that age bracket.
There were fewer than 1,000 Travellers aged 65 and over.
The vast majority, 8,541 or 80.2%, were unemployed.
Almost one in eight, or 11.3%, stated that they were unable to work due to a disability.
This was almost three times the rate in the general population (4.3%).
Almost one-third (31.9%) of Travellers aged 15 to 29 were married compared with just over one in 20 (5.8%) of the general population.
The divorce rate was less than half that of the general population - 2.2% compared to 4.7%.
The CSO's analysis states that educational attainment among Travellers continues to lag significantly behind that of the general population.
Just 13.3% of Traveller females were educated to upper secondary level or above, less than one-fifth of the share of the general population (69.1%).
Nearly six in ten male Travellers (57.2%) were educated to primary level at most, over four times the proportion (13.6%) of the general population in that category.
167 Travellers had a third-level qualification - almost twice the number recorded in 2011.
Dublin city and suburbs had the largest concentration of Travellers with 5,089 persons.
This was followed by Galway city and suburbs with 1,598 persons, and Cork city and suburbs with 1,222.
Among towns with 1,500 or more Irish Travellers, Tuam had the highest number with 737, followed by Longford with 730.
Navan, Mullingar, Dundalk and Ballinasloe all had 500 or more Irish Travellers in 2016.
Travellers comprised 0.7% of the general population in last year's census.
There were 8,717 Traveller households which is defined as households containing at least one Irish Traveller.
This was an increase of 12.3% over the previous five years.
Traveller households were more likely to be "multiple family", with that category accounting for 4.2% of the total compared with 1.3% of the general population.
However, Traveller households were less than half as likely to be one-person households - 11% compared with 23.6%.
