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Look up “Method of Equal Proportions.”
This will tell you how seats are allocated.
Under the Census Bureau’s current estimates, Rhode Island (2nd seat) would indeed receive the 435th and final seat in the Congresses of the 2020’s.

New York’s 27th seat would be the next seat, if the House were expanded to 436. Then Minnesota’s 8th seat (so Minnesota will lose a seat unless their population grows quicker than NY and RI in the next 2 yr and 4 mo. After that comes Montana’s 2nd seat - so Montana is close to getting a 2nd seat. Whether they can pass MN, NY, and RI before the next census is another story.
The next on the list is WV 3 - so yes, WV is close to losing yet another seat. After that comes AZ 10 which if it passed WV, MT, MN, NY, and RI would gain a seat.