Recently, it has been established that Chern insulators possess an intrinsic two-dimensional electric polarization, despite having gapless edge states and non-localizable Wannier orbitals. This polarization, P⃗ o, can be defined in a many-body setting from various physical quantities, including dislocation charges, boundary charge distributions, and linear momentum. Importantly, there is a dependence on a choice of real-space origin o within the unit cell. In contrast, Coh and Vanderbilt extended the single-particle Berry phase definition of polarization to Chern insulators by choosing an arbitrary point in momentum space, k⃗ 0. In this paper, we unify these two approaches and show that when the real-space origin o and momentum-space point k⃗ 0 are appropriately chosen in relation to each other, the Berry phase and many-body definitions of polarization are equal.