Population
1821 : 293,112
1831 : 376,956

Representative
John Browne, Esq., (cousin to the Marquess of Sligo), 2 Mansfield street, London and Mount Brown, Co. Mayo
Dominick Browne, Esq., Brookes Club House, London and Castlemacgarret, Co. Mayo.

Lord Lieutenant
The Most Noble, The Marquess of Sligo, Westport House, Co. Mayo; Brownstown Lodge, Co. Kildare and Mansfield street, London.

High Sheriff
John Gardiner, Esq., of Farmhill, Kilala

Custos Rotulorum
The Most Noble, the Marquess of Sligo.

Deputy Lieutenants
The Lord Clanmorris, Newbrook
Sir Samuel O’Malley, Bart., Kilbryde House
Sir Richard A. O’Donnel, Bart., Newport House
Andrew Crean Lynch, Esq., Hollybrook
Lieut.-Colonel Dominick Browne, Brownehall
Valentine Blake, Esq., Towerhill
Colonel George Jackson, Anniscoe
George Henry Moore, Esq., Moorehill
Patrick Kirwan, Esq., Dalgan Park
Thomas Spencer Lindsay, Esq., Hollymount
Major Owen O’Malley, Spencer Park
Dominick Browne, Esq., M. P., Castlemacgarret
John Knox, Esq., Castlerea
George Ormsby, Esq., Gortner-Abbey
James Browne, Esq., Claremount
John Ferderick Knox, Esq., Mountfalcon
Charles Kirwan,, Esq.
Henry Knox, Exq., Netley, Ballina

MAGISTRATES

Militia, North Mayo Staff, stationed at Ballina
Colonel: George Jackson, Esq.
Adjutant : Major Oliver Jackson
Agents: Armit & Co.

South Mayo Staff, stationed at Westport
Colonel : The Marquess of Sligo
Adjutant : Captain Fitzgerald Higgins
Agents : Cane & Co.

Clerk of the Crown: John William Browne, Esq., 16 Kildare street, Dublin
Clerk of the Peace: Thomas Gildea, Esq. Ballinrobe
Treasurer : William Orme, Esq., Glanmore, Crosmolina
Secretaries to the Grand Jury: A Clendining, and A. Lambert, Esqrs. Westport
Sub-Sheriff: James O’Malley, Esq., Castlebar
Returning Officer: Edmond J. Nolan, Esq., 2 Inn’s quay (?Dublin)
Coroners: Thomas Knox, Esq., Ballina ; Joseph Bourke, Esq., Greenhill, Westport ; John Atkinson, Esq., Ballina ; James Gale, Esq., Ballinrobe .

County Gaol, Castlebar
Inspector: Rev. James Hamilton
Chaplain: Rev. Henry Paisley
Roman Catholic Chaplain (R.C.) Rev. R. Gibbon
Presbyterian Chaplain: Rev. John Hamilton
Physician : William Hamilton, M.D.
Apothecary: Mr. John Finglas
Governor: Mr. John M. Rogers

Distributor of Stamps : J. Larminie, Castlebar.
County Infirmary : Surgeon : George Howse, M. D.

Commissioners of Affadavits
John Atkinson, Ch.K.C.E., and special bail, K.E., Ballina
Robert Blakeney, Ch.K.C.E., and special bail, K.C., Castlebar
B. Cassidy, Ch. K.C.E., and special bail, C. Claremorris
James Conry, K.C., and special bail, Castlebar
Thomas Conyngham, Ch. K.C.E., and special bail, Claremorris
Andrew Edmondson, Ch. E.
A. J. Fowler, Ch. K.C.E., Castlebar
James Gale, C. Ballinrobe
Thomas Gibbons, Ch. K.C.E.
James Higgins, Ch. K.C..E., and special bail, K.E., Ballina
Thomas Knox, Ch. C.E., Stonehall
John McAndrew, Ch. K.C.E., and special bail, K.C.E., Westport