After 16 years representing the electorate of Parkes, Mark Coulton has announced he will not be contesting the seat at the next federal election.

He said the decision came with "mixed emotions".

"It has been an incredible honour to represent the people of the Parkes electorate for more than 16 years, but the time has come for me to step aside," he said.

"I've spent the past 16 years travelling hundreds of thousands of kilometres across my electorate, getting to know the strong and vibrant communities I represent.

"It has been a great privilege and I'm extremely proud of everything we've been able to achieve over that time."

Mr Coulton became the Member for Parkes after winning 46.77 per cent of the vote during the 2007 federal election on November 24. At the May 2022 election he was re-elected for a sixth time.

Coming from a farming background and only having visited Canberra once, Mr Coulton said adjusting to life in federal parliament has meant spending a lot of time building relationships.

"Until you see a picture of me 15 years ago it's a bit hard to believe how quickly the time has gone," Mr Coulton said.

"When I first got elected it was a steep learning curve. But it hasn't taken me very long to go from the new kid on the block to someone who's now one of the longest serving members in the current party room."

With the Parkes electorate covering 49 percent of NSW, it has also meant a lot of time on the road. Mr Coulton reckons he's driven over one million kilometres on parliamentary business.

"In a big year I would drive about 80,000 kilometres - if you average 70,000 by 15 years, that's how much it is," he said.

"I know all the spots where the phone works now and where it doesn't."

But the challenges that come with life on the road and in politics are worth it to be able to see projects through and make a difference in people's lives, Mr Coulton said.

"The opening of the Western Cancer Centre, greater support for local government, and the progression of the Inland Rail, were all priorities close to my heart when I began this journey," he said.

Mr Coulton said in the meantime he will continue to "proudly represent this wonderful electorate with the utmost enthusiasm".

"It's time for a fresh face to take up the baton and I'm looking forward to the members of The Nationals in the Parkes electorate finding a suitable replacement who can continue to provide strong representation in Canberra," he said.

Nationals Leader David Littleproud said Mark Coulton was a highly respected Member of Parliament who had served the Parkes electorate and his nation with enormous integrity and hard work.

"It is no easy feat to serve in Parliament for 16 years but Mark has served with the utmost integrity and has been a trusted source of advice and guidance to those around him," Mr Littleproud said.

"He has fought for better regional services and has served in the Ministry in Regional Health, Regional Communication and Local Government, as well as Assistant Minister for Trade, Tourism and Investment.

"Mark is a strident advocate for Inland Rail and the benefits it will deliver to his local communities, industries and regional Australia."

Mr Littleproud said Mr Coulton's "real world and real life experience" had enabled him to stand up for the challenges regional communities faced.

"While working hard, Mark has had a smile on his face and been a pleasure to have onboard," Mr Littleproud added.

"He has served with conviction and never wavered in his beliefs. Our party and indeed our nation is better for having Mark Coulton on the team and we thank him for his service."

There is currently a review of federal electoral divisions underway.

The Redistribution Committee will review all ideas, suggestions, and comments, and release the proposed division names and boundaries in early to mid 2024.

"The independent Redistribution Committee will consider existing boundaries, however the recent entitlement determination confirmed New South Wales seats in the House of Representatives is decreasing from 47 to 46, and this will require most of the state's federal divisions to be altered to some degree," Australian Electoral Commissioner Tom Rogers said.

The next Federal Election must be held on or before September 27, 2025.