You can fit all people on Earth into Texas with the polulation density of New York.
The population density of New York is 27000 people per square miles. (Source: https://www1.nyc.gov/site/planning/data-maps/nyc-population/population-facts.page )
The area of Texas is 268,597 mi² (Source: https://en.wikipedia.org/wiki/Texas )
Which means you can fit 7,252,119,000 people in Texas, which is approximate the number of people on Earth.