Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_19211 ( "Name" text, "2011 Census" real, "2006 Census" real, "% change" text, "Land area (km\u00b2)" text, "Density (pop/km\u00b2)" text, "Population rank" real )

### Question ###
How many locations had a density (pop/km ) of 91.8 in the 2011 census?

### Accurate SQL ###

SELECT COUNT("2011 Census") FROM table_19211 WHERE "Density (pop/km\u00b2)" = '91.8'