Mid-2009 population estimates give Aberystwyth's population as:
There were 13,735 students registered with Aberystwyth University during academic year 2008/9, of whom 7,275 were full-time. Accordingly, it is reasonable to assume roughly an additional 8,000 students can be added to the population during termtime.
Aberystwyth is located in Ceredigion county, which covers 693 square miles. People living in the Aberystwyth area made up over 46% of the county's mid-2009 population of 37,500.
Detailed mid year population estimates for Aberystwyth are as follows:
| Ward | Jun 2001 | Jun 2005 | Jun 2009 |
|---|---|---|---|
| Aberystwyth Bronglais | 1967 | 1840 | 2234 |
| Aberystwyth Central | 2167 | 2102 | 2109 |
| Aberystwyth North | 1953 | 2079 | 2068 |
| Aberystwyth Penparcau | 3092 | 2931 | 2922 |
| Aberystwyth Rheidol | 2442 | 2576 | 2536 |
| Total: | 11621 | 11528 | 11869 |
Faenor and Llanbadarn Fawr wards contain settlements that are essentially suburbs of Aberystwyth, such as Llanbadarn, Comins Coch and Waunfawr.
| Ward | Jun 2001 | Jun 2005 | Jun 2009 |
|---|---|---|---|
| Faenor | 2416 | 2356 | 2484 |
| Llanbadarn Fawr (Padarn & Sulien) | 2920 | 2977 | 2935 |
The 2001 census confirmed that Aberystwyth residents are more likely to use or understand Welsh than is average for Wales:
| Ability | Aberystwyth area | Wales average |
|---|---|---|
| Understands spoken Welsh | 39% | 24% |
| Speaks Welsh | 34% | 21% |
| Reads Welsh | 33% | 20% |
| Writes Welsh | 29% | 18% |
| Speaks, reads or writes Welsh | 37% | 23% |
These statistics include Faenor and Llanbadarn wards.