We know fantasy worlds have villages, towns and cities. But how big exactly are they? I didn't do the math, so here's some extreme simplifications for your convenience.

Medieval

Village
Population: 200
Size: 1 ha
Approximately: the area inside of a 400m sports track

Town
Population: 2,500
Size: 15 ha
Approximately: Ellis Island (11ha) + Liberty Island (5.5 ha), New York (USA) 

City
Population: 10,000
Size: 65 ha
Approximately: The area of Disneyland Park, California (USA) or Vatican City

Large City
Population: 50,000
Size: 300 ha
Approximately: The area of Central Park, New York (USA) or Medieval Paris

Metropolis
Population: 100,000 - 1 million
Size: varies
Approximately: Medieval Constantinople, Rome or Baghdad

Approximations
The above are approximations of medieval statistics. You can adjust these sizes by doubling or halving the population or area to create dense or scarce locations. The numbers are based on Medieval Demographics Made Easy by S. John Ross.

Modern

Village
Population: 1000
Size: 0.5 km²
Approximately: Blockley, Gloucestershire, England

Town
Population: 10,000
Size: 20 km²
Approximately: Pélissann, Aix-en-Provence, France

Large Town
Population: 50,000
Size: 50 km²
Approximately: Woodstock, Ontario, Canada

City
Population: 250,000
Size: 100 km²
Approximately: Stoke-on-Trent, Staffordshire, England

Conurbation
Population: 3 million
Size: 350,000 km²
Approximately: City of Berlin, Germany 

Approximations
The above are approximations based on statistics from real-life Earth. The locations have kept their populations approximately the same between years 2010 to 2020, so unless major population changes have happened they should still look relatively correct.

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