In 1950, the Standard Deviational Ellipse (SDE) representing 68% of Tulsa’s civic organizations was 2.3 square miles. This area is represented by the green shaded area. The blue rectangle represents Tulsa's core downtown, an .86 square mile area.
Tulsa's Civic Organizations 1950-2000
Over a five decade period, the ellipse containing 68% of Tulsa’s civic fauna grew from 2.3 to 46.2 square miles. As downtown declined as a habitat for civic organizations, the groups moved steadily away from the core downtown area (blue rectangle) toward the southeast. 2000’s SDE barely captures half of the former downtown core.
By 2000, citywide civic fauna (as represented by the SDE) was only 2.2% as geographically dense as it had been in the downtown