  (Abridged) We present H-alpha images of five edge-on galaxies: NGC 891, NGC
4631, NGC 4244, NGC 3003, and UGC 9242. We also analyze [SII] 6717+6731A and
[OIII] 5007A images of NGC 4631. We analyze the ionized gas content, with
particular attention to the diffuse ionized gas (DIG). The DIG layer in NGC 891
is traced out to at least 5 kpc from the midplane, confirming an earlier
spectroscopic detection. The DIG in four of these galaxies contributes 40 to
50% of the total H-alpha luminosity, similar to face-on galaxies, but in NGC
891 the DIG contributes 80 to 90%. This is likely due to the higher dust
content in the disk of NGC 891 which obscures the HII regions. Our very deep
image of UGC 9242 shows very low surface brightness emission, as low as 0.3 pc
cm^-6, reaching 4 to 5 kpc above the midplane. This galaxy also exhibits
filaments near the bright H-alpha nucleus, an indication of a starburst
superwind. In NGC 4631 we see a very large shell of emission extending 3.5 kpc
into the halo. The [SII]/H-alpha and [OIII]/H-alpha ratios in NGC 4631 are
consistent with the ratios seen in other galaxies, and with photoionization
models. There is a region on the SE side of disk where the
[OIII]/(H-alpha+[NII]) ratio reaches over 1.0 in the DIG, which coincides with
an HI supershell. We use our very deep images of NGC 3003 and UGC 9242 to
search for ionized gas in the outer disk. We find no outer disk emission down
to our 1-sigma limit of 0.13 pc cm^-6 on scales of 1.5 kpc in NGC 3003. Based
on this limit we rule out a metagalactic ionizing radiation field stronger than
11x10^-23 ergs/cm^2/s/Hz/sr. There is an indication of extended disk emission
in UGC 9242 which would imply a stronger radiation field, but various concerns
lead us to question this feature.
