Westeros: The North

• The Great Houses are few and far in-between. Ancient lineage and a history of maintaining power as a House are what make the Great Houses. (Status 7)
• The Major Houses - those that stand equivalent with the Starks save for their designation as Wardens of the North - tend to be rare. (Status 6)
• The Minor Houses are the most common of all the noble houses. Most command a small fortification, a few leagues worth of domain and the smallfolk who work them, and spend their time trying to war with or marry into their neighboring Houses. (Status 4 - 5)
• Landed Knight Households are the households of successful or wealthy knights who have been granted land by the House they serve. They are often given a fortification or estate to manage and defend, though they are still within the service of their patron House. Such households are denied "pit and gallows," and may not use the title "Lord" for their heads of household; their heads of household are instead called "Master." A Knightly Household in service to the Crown or the Warden of one of the directions is accorded slightly higher Status, and referred to as a "masterly house." (Status 3, 4 for Masterly Houses)

Great House (Status 7)

• House Stark: Great House (Status 7). Lord Eddard Stark, of Winterfell, Warden of the North.

The Wolfswood, the Barrowlands and the Rill

Houses of the Wolfswood & Barrowlands

Major Houses

• House Glover: Ser Galbart Glover, Master of Deepwood Motte.
• House Tallhart: Ser Helman Tallhart, Master of Torrhen's Square.

Minor Houses

Status 5

• House Cerwyn: Lord Medger Cerwyn, of Castle Cerwyn.
• House Dustin: Lady Barbrey Dustin, Lady of Barrowton.
• House Poole: Lord Vayon Poole, of Winterfell.
• House Ryswell: Lord Rodrik Ryswell, Lord of the Rills.
• House Wisent: Lord Josian Wisent, of Wisenwood.

Status 4

• House Condon: Lord Arvyn Condon, of Condon Keep. Sworn to House Cerwyn.
• House Ironsmith: Lord Felton Ironsmith, of Ironsmith Hall.
• House Moss: Lady Tarah Moss, of Greensward Tower.
• House Slate: Lord Cregon Slate, of the Grey Keep.
• House Stout: Lord Harwood Stout, of Barrowton. Sworn to House Dustin.
• House Waterman: Lady Merise Waterman, of the Knifewatch. Sworn to House Manderly.
• House Whitehill: Lord Torvyn Whitehill, of Whitehill. Sworn to House Tallhart.

Knight Households

Status 4

• House Cassel: Ser Rodrik Cassell, Master-of-Arms of Winterfell.

Status 3

• House Blackhorn: Ser Kromley Blackhorn, of Blackhorn Vale. Sworn to House Wisent.
• House Septwood: Ser Parker Septwood, of the Rillwatch. Sworn to House Ryswell.

The Far North

Houses of the Far North

Major Houses

• House Umber: Greatjon Umber, of Last Hearth.

Minor Houses

Status 5

• House Lake: Brandon Lake, of the Lake House.

Status 4

• House Mormont: Maege Mormont, of Bear Island.

Status 4 (Mountain Clans)

• House Burley: Soren Burley, the Burley of Clan Burley.
• House Harclay: Adley Harclay, the Harclay of Clan Harclay.
• House Knott: Rufus "Redwine" Knott, the Knott of Clan Knott.
• House Liddle: Torren Liddle, the Liddle of Clan Liddle.
• House Norrey: Brandon Norrey, the Norrey of Clan Norrey.
• House Wull: Hugo "Big Bucket" Wull, the Wull of Clan Wull.

Other

• Night's Watch: A sworn brotherhood of men who take oaths casting aside their former lives - crimes, nobility and name - to defend the Wall from the wildlings that lie beyond it. Their seat is Castle Black, and they maintain two other strongholds: Shadow Tower and Eastwatch-by-the-Sea

The Eastern Coast

Houses of the Eastern Coast

Major Houses

• House Bolton: Roose Bolton, of the Dreadfort
• House Karstark: Rickard Karstark, of Karhold
• House Manderly: Wyman Manderly, of White Harbor

Minor Houses

Status 5

• House Flint of Widow's Watch: Lyessa Flint, of Widow's Watch.
• House Hornwood: Halys Hornwood, of Hornwood.
• House Locke: Ondrew Locke, of Oldcastle.

Status 4

• House Burley: Soren Burley, the Burley of Clan Burley.
• House Lake: Brandon Lake, of the Lake House.
• House Lightfoot: Ruldolf Lightfoot, of the Riverfort.
• House Mollen: Orten Mollen, of Wenderly Keep.
• House Norrey: Brandon Norrey, the Norrey of Clan Norrey.
• House Overton: Reese Overton, of Overwatch Cliffs.
• House Wells: Sanderson Wells, of Wellshire Keep.
• House Woolfield: Yros Woolfield, of Foldton.

Skagos Island

Houses of Skagos Island

The people of Skagos call themselves Skagosi, which means "Stoneborn" in the Old Tongue, but other northmen call them "Skaggs." Descendents of the First Men, Skagosi are savage, little more than tribes of raiders who are thought to be cannibals.

It's said that in ancient days, men of Skagos sailed to Skane, seizing all the women, killing all the men, and feasting on their hearts and livers for a fortnight. Skane has been uninhabited since.

Minor Houses

Status 4

• House Crowl: Dargyn Crowl, of Deepdown.
• House Magnar: Thuran Magnar, of Kinghouse.
• House Stane: Sumner Stane, of Driftwood Hall.

Ancestral Weapons of the North

A handful of Houses in the North are known to maintain ancestral weapons crafted from Valyrian Steel.

• House Stark: Ice, a greatsword.
• House Wisent: Steelhorn, originally a longsword, reforged into a Braavosi blade.
• House Whitehill: Starfall, a war lance.

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Note: Though this is for a canonical setting element in the Song of Ice and Fire, some of the information here is totally created for my game, and should not be taken as an authoritative commentary on that setting element.