Australian Capital Territory (Australia) is 20 times larger than Hayward, California.
Australian Capital Territory is a territory in the south east of Australia, enclaved within New South Wales. It is the smaller of the two self-governing internal territories in Australia. The only city and by far the most populous community is Canberra, the capital city of Australia. Wikipedia
Area: 117 km2 calculated
Hayward is a city located in Alameda County, California in the East Bay subregion of the San Francisco Bay Area. With a population in 2014 of 149,392 Hayward is the sixth largest city in the Bay Area and the third largest in Alameda County. Wikipedia