We present a list of 109 pulsars with independent distance information comp
iled from the literature. Since the compilation of Frail & Weisberg, there
are 35 pulsars with new distance estimates and 25 pulsars for which the dis
tance or distance uncertainty have been revised. We used this data to fit a
smooth, axisymmetric, two-disk model of the distribution of Galactic elect
rons. The two exponential model components have mean local midplane densiti
es at the solar circle of 2.03 x 10(-2) and 0.71 x 10(-2) cm(-3), and scale
heights of 1.07 and 0.053 kpc. The thick component shows very little radia
l variation, while the second has a radial scale length of only a few kilop
arsecs. We also examined a model that varies as sech(2) x, rather than exp
(-x), in both the radial and vertical directions. We prefer this model with
no midplane cusp but find that the Dt parameters essentially describe the
same electron distribution. The distances predicted by this distribution ha
ve a similar scatter to that produced by the more complex model of Taylor &
Cordes. We examine the pulsars that deviate strongly from this model. Ther
e are two regions of enhanced dispersion measure, one of which correlates w
ell with the Sagittarius-Carina spiral arm. We find that the scatter of the
observed dispersion measure from the model is not fitted well by either a
normal or a lognormal distribution of lump sizes but may be caused instead
by the uncertainties in the distances.