The city's GIS Coordinator, Todd Green, says Moline's population has been slowly shifting from the older part of the city, in the northwest, to the newer part in the southeast.
"So Ward 1 has been losing population and Ward 7 has been gaining population since the ward maps were originally drawn. And now Ward 7 exceeds that 10 per cent deviation from the mean rule and Ward 1 falls below that threshold."
The Illinois Municipal League recommends keeping population differences among the wards at 10 per cent or less, and city leaders are hoping not to split up any precincts between two wards, and to make sure no current alderman would lose their seat.
Green says only one option meets all three criteria.
Moline's official population is now 42,981 - down about one per cent from 2010 (43,376), and 2.3 per cent lower than the official count in 2,000 (44,017).