We present a list of 109 pulsars with independent distance information compiled from the literature .
Since the compilation of Frail & Weisberg , there are 35 pulsars with new distance estimate and 25 pulsars for which the distance or distance uncertainty have been revised .
We used this data to fit a smooth , axisymmetric , two disk model of the distribution of galactic electrons .
The two exponential model components have mean local midplane densities at the solar circle of 2.03 \times 10 ^ { -2 } \mbox { ~ { } cm } ^ { -3 } and 0.71 \times 10 ^ { -2 } \mbox { ~ { } cm } ^ { -3 } , and scale heights of 1.07 and 0.053 kpc .
The thick component shows very little radial variation , while the second has a radial scale length of only a few kiloparsecs .
We also examined a model which varies as \mbox { sech } ^ { 2 } ( x ) , rather than \exp ( - x ) , in both the radial and vertical direction .
We prefer this model with no midplane cusp , but find that the fit parameters essentially describe the same electron distribution .
The distances predicted by this distribution have a similar scatter as the more complex model of Taylor & Cordes .
We examine the pulsars that deviate strongly from this model .
There are two regions of enhanced dispersion measure , one of which correlates well with the Sagittarius-Carina spiral arm .
We find that the scatter of the observed dispersion measure from the model is not fit well by either a normal or log-normal distribution of lump sizes , but may be caused instead by the uncertainties in the distances .