We have assembled 21-cm linewidths for 376 of the 732 galaxies in a magnitude-limited redshift survey of the Perseus-Pisces region. We analyze a distance limited subset of 271 galaxies (131 widths) to examine the relationship between linewidth and local density. The sample indicates that galaxies with linewidths ~> 480 km/s are absent from regions where the galaxy density is <~ 0.03 galaxies Mpc^-3^ (M_B(0)_ < - 18.3). This effect is in the direction predicted by standard CDM models. Galaxies with linewidths <~ 480 km/s appear throughout the sample. The observational constraints could be substantially improved with a larger sample, IR photometry, and more uniform 21-cm data.