As part of the Canadian Galactic Plane Survey (CGPS), we have completed a survey of polarized emission at 1.4 GHz from the Galactic plane. Combination of data from the DRAO Synthesis Telescope, the Effelsberg 100-m Telescope and the DRAO 26-m Telescope gives full sampling of polarized emission from the largest structures down to the resolution limit, $\sim$1 arcminute. The survey extends from ${\ell}={65^{\circ}}$ to ${\ell}={175^{\circ}}$ over a range ${-3.5^{\circ}} < b < {5.5^{\circ}}$ along the northern Galactic plane, with a high-latitude extension from ${\ell}={105^{\circ}}$ to ${\ell}={120^{\circ}}$ up to ${b}={20^{\circ}}$.} This is the first extensive survey of polarized emission from the Milky Way to combine data from aperture-synthesis and single-antenna telescopes and, with 17 million independent data points, it is the largest survey ever made of polarized emission.

Many new kinds of polarization features are seen. Some can be associated with known objects, such as planetary nebulae and stellar-wind bubbles, and valuable estimates of the strength and configuration of the Galactic field can be derived. Many depolarization objects are seen, but association with H$\alpha$ or radio continuum tracers of ionized gas is not straightforward. Other features have no counterpart in the other tracers of the Interstellar Medium in the CGPS or other databases.