1918 to 1950

The constituency was created by the Representation of the People Act 1918 as one of four constituencies covering the county of Ayr and the county of Bute. Of the other three constituencies, two were county constituencies: Bute and Northern Ayrshire and South Ayrshire. The third, Ayr Burghs, was a district of burghs constituency. All four constituencies were entirely within the boundaries of the two counties.

The Kilmarnock constituency consisted of "The county district of Kilmarnock, inclusive of all burghs situated therein except insofar as included in the Ayr District of Burghs."

The counties of Ayr and Bute had been covered, previously, by the five constituencies of Ayr Burghs, Buteshire, Kilmarnock Burghs, North Ayrshire and South Ayrshire. Two of these, Ayr Burghs and Kilmarnock Burghs, had included areas (parliamentary burghs) outside the two counties.

1950 to 1974

Constituency boundaries were redrawn in 1950, creating five constituencies to cover the counties of Ayr and Bute. Ayr Burghs was abolished and two new county constituencies, Ayr and Central Ayrshire, were created. Part of the Kilmarnock constituency was transferred to the new Central Ayrshire constituency.

1974 to 1975

In 1974, the boundary between the Kilmarnock and Ayrshire Central constituencies was redrawn to enlarge Kilmarnock.

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1975 to 1983

In 1975, under the Local Government (Scotland) Act 1973, local government counties were abolished and replaced by a system of regions and districts. The areas of the counties of Ayr and Bute were merged into the Strathclyde region and, thus, the Kilmarnock constituency became one of a number covering the region. Eight years were to elapse before new constituency boundaries took account of new local government boundaries.

In 1983 the Kilmarnock constituency was merged into the Kilmarnock and Loudoun constituency.

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Elections in the 1910s

Elections in the 1920s

Elections in the 1930s

Elections in the 1940s

Elections in the 1950s

Elections in the 1960s

Elections in the 1970s