Europe-Places.com has listed approx 7 Oil & natural gas companies in Co. Mayo. Some of the Top rated Oil & natural gas companies in Co. Mayo are- Corrib Oil Ballyhaunis, Corrib Oil Ballyhaunis, Corrib Oil Ballyhaunis, Corrib Oil Ballyhaunis, Vermilion Energy Ireland, Vermilion Energy Ireland & Vermilion Energy Ireland.