Hi Anne,
I popped down to the Minnesota Historical Society Library today and had a look for your Daniel. Some interesting developments...
First thing, I wanted to try to see what his family looked like in the 1895 Minnesota State Census. This is not indexed

so I first went to the 1895 directory to see where he was living to get an idea of where he might be in the census. After scrolling through a number of neighborhoods, there he was!
1895 Minnesota, Ramsey County, St Paul, 6th ward, 7th precinct, p.3 (or 235 on the upper right)
191 Concord St
Scullon Daniel, 38, born in Ireland, 7 years resident in Minnesota, 6mos resident of current enumeration district, Engineer, Father and mother of foreign birth
Scullon, Mrs. Daniel, 29, born in Ireland. 7 years resident in Minnesota, 6mos resident of current enumeration district, Father and mother of foreign birth
Scullon, Charles, 17, born in Scotland, 7 years resident in Minnesota, 6mos resident of current enumeration district, Father and mother of foreign birth
Scullon, Agnes, 13, born in Scotland, 7 years resident in Minnesota, 6mos resident of current enumeration district, Father and mother of foreign birth
Scullon, John, 12, born in Scotland, 7 years resident in Minnesota, 6mos resident of current enumeration district, Father and mother of foreign birth
Scullon, Mary, 10, born in Scotland, 7 years resident in Minnesota, 6mos resident of current enumeration district, Father and mother of foreign birth
Scullon, Margaret, 1 1/2, born in Minn, 1 year 1 mo resident in Minnesota, 6mos resident of current enumeration district, Father and mother of foreign birth
Scullon, Gertrude, 6, born in Minn, 6 years resident in Minnesota, 6mos resident of current enumeration district, Father and mother of foreign birth
So, it looks like "Mrs. Daniel" (thanks, for giving your name

) is way too young to be Sarah Murray. And there is a gap in the children's births that suggests the death of one spouse and remarriage to another. So... I asked if there was some sort of index for marriages that far back. Of course there isn't, except at the beginning of each volume on the microfilm. So, I started going through those, from 1891 on. I had decided already that Gertrude was either Mary's from her previous marriage, or Sarah's last child. On the seventh volume... there it was!
Book 13 p. 605
Daniel Scullion and
Mrs. Mary Hines
19 June 1893
So, I went back to check the directories in 1892, to see if Mrs Mary Hines was in evidence. Of course, only the head of household is listed, so unless she was listed as a widow, there was no way of knowing it was her. As luck would have it, there were no less than THREE Mary Hines widows in St Paul in 1892

The directory was obliging enough to tell us when one of the Mr. Hines died, but he looks too old to be our Mary's husband.
Hines John died May 24, '92, age 50
Hines Mary (wid John), res. 381 E 6th
Hines Mary (wid Wm), bds 1138 Frances
Hines Mary C (wid Samuel W), clk Central Cloak Co, bds 669 Canada
The 1893 directory seemed to be missing, so I checked 1894. Every single Widow Mary Hines is gone! Hmmm. That doesn't help much, does it? Next time I went back to the cart I saw that 1893 had reappeared. Both Wid John and Wid Samuel W are listed, but not Wid Wm. No indication, of course, as to when the information for the 1893 directory was actually gathered. Wid Wm could be our Mary, but no guarantee. I'm inclined to believe that one also because of her son's name. This is where it would be so nice if the 1890 census hadn't been destroyed! Oh well. So, I went through and got all the directory information. Looks like he was delinquent in his Montana taxes because he was back in St Paul. At least the directory is kind enough to say when he left for Montana the first time.
1886-87 NOT THERE
1888
Scullion Daniel, lab, bds 439 John
1889
Scullion Daniel, fireman C St P & K C Ry, res. 36 Prospect ter.
1890
Scullon David (sic) eng, C St P & K C Ry, res. 48 Isabel
1891
Scullion Daniel, eng, C St P & K C Ry, res. 48 Starkey
1892
Scullion Daniel, eng. C St P & K C Ry, res. 376 Livingston Av
1893
Scullion Daniel, eng. C St P & K C Ry, res. 376 Livingston Av
1894
Scullion Daniel, eng. C St P & K C Ry, res. 425 1/2 S. Robert
1895
Scullon, Daniel, eng. res 191 Concord
Scullon, Charles A, comp. bds 191 Concord
1896
Scullon Daniel, eng. r 185 Lafond
1897
Scullon Daniel, moved to Anaconda, Mont.
1898 NOT THERE
1899 NOT THERE
1900
Scullon Daniel, eng. r. 616 Temperance
1901
Scullon Daniel, eng. r. 788 Fauquier
1902
Scullon Daniel, eng. r. 861 Beech
1903 NOT THERE
You'll note that like many people in cities at that time, he moved house nearly every year-- sometimes more than once!
I was going to print you out the census and the marriage cert. (you have to take them to a different machine) but as I was going over to get in line for the printer machines, I looked at my watch and realized I had to run if I was going to make my 3:15 appointment across town

Got so wrapped up in Scullions I didn't notice the time

So I will print you out copies next time I am down there. For the moment, you'll have to trust me on the transcription
Have fun with this!
Sarah