The House of Commons (Method of Voting and Redistribution of Seats) Act (Northern Ireland), 1929 introduced first-past-the-post elections for 48 single-member constituencies (including Antrim North).

This constituency was one of seven county divisions in Antrim, so it was smaller than the UK Parliament seat.

There has never been the slightest chance of a republican or nationalist candidate being elected in a single-member Antrim county constituency, however the boundaries were drawn.

At the Northern Ireland general election of 1929 the new Antrim North division was the scene of a reasonably close Unionist/Liberal contest (less than a 20% majority).

However this was the last appearance of a Liberal candidate for the Northern Ireland Parliament constituency, which became an extremely safe Unionist seat for the rest of its existence.