The Earth's circumference measured between the North and South poles is approximately 40,008 kilometers (24,860 miles). This is also known as the polar circumference.

It's important to note that this is slightly shorter than the Earth's equatorial circumference, which is approximately 40,075 kilometers (24,901 miles). This difference is due to the Earth's slightly oblate shape, meaning it bulges at the equator and is flattened at the poles.