The ORR have published the estimates of station usage for 2017-18.
http://orr.gov.uk/statistics/published-stats/station-usage-estimates
Barton 39488 (down 0.7%) 1514 season ticket uses
Barrow Haven 1432 (down 6.2%)
New Holland 14254 (down 4.9%) 872 season ticket uses
Goxhill 14362 (up 7.7%) 1588 season ticket uses
Thornton Abbey 1042 (up 0.2%) 226 season ticket uses
Ulceby 7872 (up 19.3%) 956 season ticket uses
Habrough 33412 (-0.9%) 2782 season ticket uses, 32 interchanges
Stallingborough 10112 (down 4.6%) 482 season ticket uses
Healing 8820 (down 10.2%)
Great Coates 11144 (up 7.6%) 792 season ticket uses
Grimsby Town 454166 (up 3.7%) 18526 season ticket uses, 10834 interchanges
Grimsby Docks 4502 (down 1.6%) 2018 season ticket uses
New Clee 1236 (down 3.9%) 20 season ticket uses
Cleethorpes 285412 (down 0.9%) 4790 season ticket uses