| Monmouthshire Welsh: Sir Fynwy |
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Flag adopted in 2011 |
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Monmouthshire shown within Great Britain ![]() Monmouthshire shown as a county of Wales |
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| Area | |
| • 1831 | 324,310 acres (1,312.4 km2) |
| • 1901 | 345,048 acres (1,396.36 km2) |
| • 1961 | 339,088 acres (1,372.24 km2) |
| • 2011 | 346,735 acres (1,403.19 km2) |
| Population | |
| • 1831 | 98,130 |
| • 1901 | 230,806 |
| • 1961 | 444,679 |
| • 2011 | 503,917 |
| Density | |
| • 1831 | 0.3/acre |
| • 1901 | 0.7/acre |
| • 1961 | 1.3/acre |
| • 2011 | 1.45/acre |
| History | |
| • Origin | Laws in Wales Act 1535 |
| • Created | 1535 |
| • Succeeded by | Gwent, Mid Glamorgan, South Glamorgan |
| Status |
Historic county Ceremonial county (until 1974) Administrative county (1889–1974) |
| Chapman code | MON |
| Government | Monmouthshire County Council (1889-1974) Newport County Borough Council (1891-1974) |
| • HQ | Monmouth and Newport |
| • Motto | Faithful to both (Utrique Fidelis) |
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Coat of arms of Monmouthshire County Council |
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Monmouthshire (/ˈmɒnməθʃər/ or /ˈmɒnməθʃɪər/), also known as the County of Monmouth (/ˈmɒnməθ/; Welsh: Sir Fynwy), is one of thirteen historic counties of Wales and a former administrative county.
It corresponds approximately to the present principal areas of Monmouthshire, Blaenau Gwent, Newport and Torfaen, and those parts of Caerphilly and Cardiff east of the Rhymney River.