The list below shows the civil registration districts in Brecknockshire between 1837 and 1974.
The same districts were used to compile the census returns for the years 1851
The ancient county of Brecknock (1837-89), sometimes known as Breconshire.the administrative county of Brecknock (1889-1974).
The county of Brecknockshire was abolished on 1/4/1974 to become parts of the counties of Powys, Mid Glamorgan, and Gwent.
|Registration District||Registration County||From||To||Comments|
|Bedwellty||Monmouthshire||1837||1894||Partly in Brecknockshire until 1894.|
|Crickhowell||Brecknockshire||1837||1974||Abolished 1.4.1974 to become part of Blaenau Gwent and Brecknock registration districts.|
|Llandovery||Carmarthenshire||1837||1897||Partly in Brecknockshire until 1.6.1897.|
|Merthyr Tydfil||Glamorganshire||1837||1934||Partly in Brecknockshire until 1.10.1934.|
|Neath||Glamorganshire||1837||1934||Partly in Brecknockshire until 1.10.1934.|
|Pontardawe||Glamorganshire||1837||1934||Partly in Brecknockshire until 1.10.1934.|
|Rhayader||Radnorshire||1837||1933||Partly in Brecknockshire until 1.4.1933.|
|Vaynor||Brecknockshire||1934||1974||Created 1.10.1934 out of Merthyr Tydfil and Neath registration districts. Abolished 1.4.1974 to become part of Merthyr Tydfil, Pontypridd, and Ystradgynlais registration districts.|
|Ystradgynlais||Brecknockshire||1934||1974||Created 1.10.1934 out of Pontardawe, Neath and Brecknock registration districts.|