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This unit contained the following units:
| Name | Type | Start | End | Authority |
|---|---|---|---|---|
| BROXBOURNE | District/Unitary Authority | Census of Population (2001 Key Statistics) | ||
| DACORUM | District/Unitary Authority | Census of Population (2001 Key Statistics) | ||
| EAST HERTFORDSHIRE | District/Unitary Authority | Census of Population (2001 Key Statistics) | ||
| HERTSMERE | District/Unitary Authority | Census of Population (2001 Key Statistics) | ||
| NORTH HERTFORDSHIRE | District/Unitary Authority | Census of Population (2001 Key Statistics) | ||
| ST ALBANS | District/Unitary Authority | Census of Population (2001 Key Statistics) | ||
| STEVENAGE | District/Unitary Authority | Census of Population (2001 Key Statistics) | ||
| THREE RIVERS | District/Unitary Authority | Census of Population (2001 Key Statistics) | ||
| WATFORD | District/Unitary Authority | Census of Population (2001 Key Statistics) | ||
| WELWYN HATFIELD | District/Unitary Authority | Census of Population (2001 Key Statistics) |
This unit was associated with the following other units:
| Nature of association | Other unit involved | Type of unit | Authority |
|---|---|---|---|
| was preceded by | HERTFORDSHIRE | Administrative County | Census of Population (2001 Key Statistics) |
| was preceded by | HERTFORDSHIRE | Ancient County | Census of Population (2001 Key Statistics) |
| was preceded by | HERTFORDSHIRE | Poor Law/Registration County | Census of Population (2001 Key Statistics) |
This unit was part of the following units:
| Name | Type | Start | End | Authority |
|---|---|---|---|---|
| EAST | Government Region | 1996 | Census of Population (2001 Key Statistics) |
If the boundaries of the Modern (post 1974) County changed over time, this map will show all the different boundaries.
How to reference this page:
GB Historical GIS / University of Portsmouth, Hertfordshire Modern (post-1974) County through time, A Vision of Britain through Time.
URL: https://www.visionofbritain.org.uk/unit/10105316
Date accessed: 15th February 2026