If Columbus and Charlotte continue to add the same amount of people each year, then we should overtake them around 2018. Making us the 15th largest city. Of course a lot can change over time.
Columbus (12,450/year)
2013: 822,553
2014: 835,003
2015: 847,453
2016: 859,903
2017: 872,353
2018: 884,803
2019: 897,253
2020: 909,703
Charlotte (18,420/year)
2013: 792,862
2014: 811,282
2015: 829,702
2016: 848,122
2017: 866,542
2018: 884,962
2019: 903,382
2020: 921,802
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2025: 1,013,902.
Just for craps and giggles I did the cities just above Columbus as well. Based on continued numerical change we will overtake each city in rankings in the year that I have bolded. We should be ranked 12th by the time the 2020 Census comes out. Crazy!
San Francisco (10,022/year)
2013: 837,442
2014: 847,464
2015: 857,486
2016: 877,530
2017: 887,552
2018: 897,574
2019: 907,596
2020: 917,618
Jacksonville (5,975/year)
2013: 842,583
2014: 848,558
2015: 854,533
2016: 860,508
2017: 866,483
2018: 872,458
2019: 878,433
2020: 884,408
Indianapolis (8,550/year)
2013: 843,393
2014: 851,943
2015: 860,493
2016: 869,043
2017: 877,593
2018: 886,143
2019: 894,693
2020: 903,243
Source: http://factfinder2.census.gov/faces/tableservices/jsf/pages/productview.xhtml?src=bkmk