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Jersey, an island in the English Channel, is about 100 km².

To help compare different orders of magnitude and geographical regions, we list here areas between 100 km² and 1000 km². See also areas of other orders of magnitude.

• Areas less than 100 km²
• 100 km² is equal to:
  • 1 E+8 m²
  • a square with sides 10 km long
  • 10,000 hectares
  • approx. 38.6 square miles
  • approx 24,711 acres
• 102 km² -- Athens, Alabama, USA
• 104 km² -- Hsinchu City, Taiwan
• 105 km² -- Srinagar, Jammu and Kashmir, India
• 115 km² -- Vancouver, British Columbia, Canada (city proper)
• 116 km² -- Jersey, Channel Islands, UK
• 121 km² -- Saint Helena Island
• 124 km² -- Nantucket Island, Massachusetts, United States
• 127 km² -- Penghu County, Taiwan
• 127 km² -- Lake Tisza, Hungary
• 133 km² -- Keelung City, Taiwan
• 143 km² -- Island of Okushiri, Hokkaido, Japan
• 148 km² -- Callao Region, Peru
• 150 km² -- London Borough of Bromley, largest London Borough
• 153 km² -- Kinmen County, China (Taiwan)
• 154 km² -- Kaohsiung City, Taiwan
• 160 km² -- Liechtenstein (country ranked 188th by area)
• 163 km² -- Taichung City, Taiwan
• 175.5 km² -- Glasgow, Scotland
• 176 km² -- Tainan City, Taiwan
• 177 km² -- Washington, D.C., United States
• 182 km² -- Rishiri Island, Hokkaido, Japan
• 185 km² -- Johor Bahru, Malaysia
• 185.5 km² -- Plano, Texas, United States
• 188 km² -- Beaver Island, largest island in Lake Michigan
• 193 km² -- Aruba
• 199 km² -- Municipality of San Juan, Puerto Rico
• 203.1 km² -- Poquoson, Virginia, United States
• 204.51 km² -- Antwerp, Belgium
• 213.5 km² -- Cleveland, Ohio, United States
• 219 km² -- Amsterdam, Netherlands
• 220 km² -- Ibiza, Spain, a Balaeric Island
• 243.65 km² -- Kuala Lumpur, the capital of Malaysia
• 246 km² -- Malta Island (main island of Malta)
• 255 km² -- Island of Shikotan, Hokkaido, Japan
• 259 km² -- Edinburgh, Scotland
• 259 km² -- Island of Martha's Vineyard, United States
• 260 km² -- Niue
• 264 km² -- Nashik, India
• 272 km² -- Taipei City, Taiwan
• 291 km² -- Cebu City, Philippines
• 282 km² -- Bagnes, Valais (largest municipality of Switzerland)
• 316 km² -- Malta (country ranked 185th by area)
• 319 km² -- Rotterdam, The Netherlands
• 360 km² -- Belgrade, Serbia
• 360 km² -- Gaza Strip
• 370 km² -- Detroit, Michigan, United States
• 380 km² -- ATE Salisbury Plain, England (the UK's largest military training area)
• 381 km² -- Isle of Wight
• 425 km² -- Gatun Lake
• 426 km² -- Oslo, capital of Norway
• 444 km² -- Chattanooga, Tennessee, United States
• 451 km² -- Seychelles
• 465 km² -- Winnipeg, Manitoba, Canada
• 468 km² -- Andorra
• 496 km² -- Prague, Czech Republic
• 500 km² -- Montreal, Quebec, Canada
• 501 km² -- Gwangju Metropolitan City, South Korea
• 517 km² -- Warsaw, Poland
• 525 km² -- Budapest, Hungary
• 530 km² -- Isle Royale, largest island in Lake Superior
• 540 km² -- Daejeon Metropolitan City, South Korea
• 570 km² -- Isle of Man
• 573 km² -- Klang, Selangor, Malaysia
• 575 km² -- Kiritimati, Kiribati
• 582 km² -- Lake Geneva
• 597 km² -- Nis, Serbia
• 604 km² -- Mumbai, India
• 606 km² -- Chicago (city proper), Illinois, United States
• 607 km² -- Madrid (city), Spain
• 614 km² -- Seoul Special City, South Korea
• 616 km² -- Lake Taupo, the largest lake in New Zealand and largest freshwater lake in Oceania
• 636 km² -- Metro Manila, Manila, Philippines
• 641 km² -- Toronto, Ontario, Canada
• 641 km² -- Zagreb, Croatia
• 647 km² -- Singapore (excluding offshore islands)
• 649 km² -- El Paso,Texas, United States
• 684 km² -- Edmonton, Alberta, Canada
• 700 km² -- Pune, India
• 704 km² -- Singapore (all land area)
• 706 km² -- Salvador, Bahia, Brazil
• 741 km² -- Bangalore, India
• 754 km² -- Dominica (country ranked 172nd by area)
• 755 km² -- Hamburg Germany
• 763 km² -- Busan Metropolitan City, South Korea
• 790 km² -- Calgary, Alberta, Canada
• 798 km² -- Perm, Perm Krai, Russia
• 810 km² -- Perlis, the smallest state in Malaysia
• 823 km² -- Kansas City, Missouri, United States
• 886 km² -- Daegu Metropolitan City, South Korea
• 892 km² -- Berlin, Germany
• 902 km² -- West Midlands (county), England
• 945 km² -- Indianapolis, Indiana, United States
• 950 km² -- Dartmoor
• 965 km² -- Incheon Metropolitan City, South Korea
• Areas more than 1000 km²