Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many states had a population density of 10188.8?

### Inputs:
table_name: table, columns: ['Rank', 'Incorporated place', 'Metropolitan area', 'State', 'Population (2010 census)', 'Land area (mi 2 )', 'Population density (people per mi 2 )']

### Response:
SELECT COUNT State FROM table WHERE Population density (people per mi 2 ) = 10188.8